I went on hiking yesterday, with some friends infrom a hiking club.

"Went hiking" is the more natural expression in English. "Went on hiking" sounds a bit awkward. Also, "from a hiking club" sounds more natural than "in a hiking club," especially in this context.

In the end, I ended up finisheding a trail of 20 kilometers with a total elevation gain of 1008 meters because this friend had made the wrong calculation.

"Ended up finishing" adds a sense of unexpected or unintended result, which emphasizes that the longer trail was not planned. "Finished a trail" is technically correct, but adding "ended up" makes the sentence flow more naturally and better reflects the situation.

Furthermore, I'm regretting that I didn' not captureing the beautiful scenery I encountered yesterday.

"Regret" is the appropriate verb to use here instead of "I'm regretting." In English, "regret" can be followed directly by a noun or gerund ("not capturing") rather than the verb phrase "I’m regretting." "I regret not capturing" is more grammatically correct and smoother.

I realized many years ago that, although many of my friends love hiking likeas I do, we appreciate different aspects of it.

"Many years ago" is fine, but simplifying it to just "years ago" makes the sentence flow more naturally. Additionally, "as I do" sounds more natural than "like I do" in this context.

I enjoy the flowers, the trees, and the streams more than the numbers I goet.

The verb tense should be consistent. Since you're talking about hiking in general, "get" is more appropriate than "got," which refers to a specific past instance. Present tense ("get") keeps the sentence general and timeless.

Sometimes, when I saw a beautiful waterfall, I wanted to stay for a minute just watching the flow and also wanted to call out to theose friends who were hurrying forward an, so I could share the beautiful aspect I had just found.

"Stay a minute" should be "stay for a minute," as "for" is needed to indicate the duration of time. "These friends" is changed to "those friends" because you are referring to people who are not immediately present, and "those" is more appropriate for this kind of reference. The second clause was restructured for smoother readability: "and share the beautiful aspect I just found" is now "so I could share the beautiful aspect I had just found" to create a clearer connection between wanting to share and what you found.

Oh, you can watch the video of the streams I captured yesterday here: https://www.youtube.com/shorts/xTdtE-8tvac ¶
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Next time, I will insist on hiking at my own pace.

"Streams" is plural, but since you are referring to a specific video, it is better to say "the stream" in singular form to focus on that particular shot.

I went (on a hike / hiking) yesterday, with some friends in a hiking club.

In this case, there is both the noun hike and the verb hike to consider. You don't combine "on a" with the verb, so if you use the verb you'd just say "hiking", while the noun doesn't get adjusted for the tense, but does combine with "on a".

I was supposed to hike 12 kilometers with a total elevation gain of 600 meters, but one of my hiking friends thought I needed to improve my numbers.

He persuaded me to try a trail of 17 kilometers17km long trail.

"trail of 17 kilometers" is correct, but "17km long trail" is more natural.

In the end, I finished a trail of 20 kilometers with a total elevation gain of 1008 meters because this friend had made the wrong calculationcalculated incorrectly.

Just rephrasing to more natural phrasing.

I realized many years ago that, although many of my friends love hiking like I do, we appreciate different aspects of it.

Can't really pause on the "that" like that, as the that wants to connect two clauses together.

I enjoy the flowers, the trees, and the streams more than the numbers I goet.

"get" to match the tense of "enjoy"

I believe the friend from yesterday understood this clearly but still wanted to change it.

Sometimes, when I saw a beautiful waterfall, I wanted to stay a minute just watching the flow and also wanted to call out to these friends who were hurrying forward and share the beautiful aspectscenery I just found.

But I didn't want to interrupt those friends, so I always capturedtook some picturehotos and videos by myself.

capturing a picture focuses a bit more on the artistic thought process of photography, while "took a photo" is more neutral and standard.

Oh, you can watch the video of some streams I captured yesterday here: https://www.youtube.com/shorts/xTdtE-8tvac ¶
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Next time, I will insist on hiking at my own pace.

I went on hiking yesterday, with some friends in (or: from) a hiking club.

I was supposhad intended to hike 12 kilometers with a total elevation gain of 600 meters, but one of my hiking friends thought I needed to improve my numbers.

“I was supposed to” sounds like someone else had decided this for you.

In the end, I finished a trail of 20 kilometers with a total elevation gain of 1008 meters because this friend {had made thea wrong calculation | had miscalculated}.

Right now, I'm fatigued because of the hike and because it’s the first day of my period.

I enjoy the flowers, the trees, and the streams more than the numbers I gotet / achieve.

“Got/get” seems unnatural but it’s perfectly understandable.

Sometimes, when I saw a beautiful waterfall, I wanted to stay a minute just watching the flow and also wanted to call out to these friends who were hurrying forward and share the beautiful aspect{scene | thing} I just found.

I went on hiking yesterday, with some friends infrom a hiking club.

Either "I went on a hike" or "I went hiking".
You don't need a "," here. It's not that useful to separate the sentence, and you don't have to take a breath.

I was supposhad intended to hike 12 kilometers with a total elevation gain of 600 meters, but one of my hiking friends thought I needed to improve my numbers.

Mostly good here. Just reworded to make it sound more natural.

In the end, I finished a trail of 20 kilometers with a total elevation gain of 1008 meters because thismy friend had made thea wrong calculation.

Right now, I'm fatigued not only because of the hike and, but also because it's the first day of my period.

Furthermore, I'm regretting that I didn't capture the beautiful scenery that I encountered yesterday.

I realized many years ago that, although many of my friends love hiking like I do, we appreciate different aspects of itthe activity for different reasons.

I enjoycare more about the flowers, the trees, and the streams more than the numbers I got of kilometers I've walked.

I believe the friend from yesterday understood this clearly but stillabout me and wanted to change it.

SometimesOnce, when I saw a beautiful waterfall, I wanted to stay just a minute justo watching the flow and also wantewater flowing, and to call out to theose friends who were hurrying forward andto share the beautiful aspect I just foundy of what I had seen.

But at the same time I didn't want to interrupt thosebother my friends, so I always captured some pictures and videos by myself.

I went on hiking yesterday, with some friends in afrom my hiking club.¶
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I went on a hike yesterday with some friends from my hiking club.

He persuaded me to try a trail of 17 kilometers.

OR
He persuaded me to try a 17-kilometer trail. (This one sounds more natural, but yours is still grammatically correct.)

In the end, I finished a trail of 20 kilometers with a total elevation gain of 1008 meters because this friend had made the wrong calculation.

"a 20-kilometer trail" sounds more natural, but your sentence is still grammatically correct.

I enjoy the flowers, the trees, and the streams more than the numbers I got.

Sometimes, when I saw a beautiful waterfall, I wanted to stay a minute just watching the flow and also wanted to call out to these friends who were hurrying forward and share the beautiful aspect I justscene I found.

"I just found" makes it sound like you found it in the present moment right now, not in the past.

But I didn't want to interrupt those friends, so I alwaysjust captured some pictures and videos by myself.

Oh, you can watch the video of the streams I captured yesterday here: https://www.youtube.com/shorts/xTdtE-8tvac ¶
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Next time, I will insist on hiking at my own pace.