Thane more I grow up, thane more I have learned about life. The more I grow up, the more I have learned about life.

You would use "the" for expressions like these.

Than more I grow upe older I've gotten, thane more I have learned about life. The older I've gotten, the more I have learned about life.

"grow up" is pretty exclusively used for going from childhood to adulthood. Sometimes adults use it in a joking way to poke fun at themselves ("When I grow up, I wanna be a movie star!") Match the tenses. You could also say "The older I get, the more I learn about life."

For these days I had bigIt's because I have a lot of experience in communication with different people (or at least I hope, because I work in a public place). It's because I have a lot of experience in communication with different people (or at least I hope, because I work in a public place).

"For these days" in my opinion doesn't fit, so I would use "It's because" "Had" implies you do not longer have the experience, which you do. People do not use "big experience" to describe having experience, "a lot of experience" would be the way to emphasize it. I rewrote the sentence in parentheses in a personal way, just to naturally emphasize the possible uncertainty of having this experience.

For these days I had bigDuring this time I have had a lot of experience in communicationg with different people (I hope because I work in public place). During this time I have had a lot of experience communicating with different people (because I work in public place).

You hope? 🤔

And wWhat I understood: is that you shouldn’t try to change their opinion about something, because they have own position about it. What I understood is that you shouldn’t try to change their opinion about something, because they have own position about it.

While the opening isn't wrong, I feel a use of a colon is unnecessary and that you should join the two clauses here. A comma before "because" in my opinion gives a needed pause.

And what I've come to understooand: you shouldn’t try to change their opinion about something, because they have their own position abouton it. And what I've come to understand: you shouldn’t try to change their opinion about something, because they have their own position on it.

"understood" sounds like you instantly understood it, but I think you mean a slower process over time (came to understand)

SomethingIt's like “the filter” of life that they standey speak of. It's like the filter of life they speak of.

I get what you mean here. I'm unsure that filter requires quotations in this case. I wouldn't use "something" here, I would opt for "it's like", and filter would require an article in this case. When referring to an idiomatic expression, "they speak of" is the more natural turn of phrase in my opinion.

SThey represent something like a “filter” of life that they stand of. They represent something like a “filter” of life.

I wasn't sure if you meant that, or this: 'Something like the "filter" of life that they view things through.'

FA few years ago, I tried to built amake polite conversation with these people, and I got nervous every time. A few years ago, I tried to make polite conversation with these people, and I got nervous every time.

As it's an indefinite quantity, I believe you would use "a" before "few years ago". Personally I would say "make conversation" rather than "build conversation". I would also use a pronoun before "got nervous", as omitting it sounds incorrect.

FA few years ago I triedwas trying to built ad polite conversations with these people and got nervous every time. A few years ago I was trying to build polite conversations with these people and got nervous every time.

"build" with "conversations" is odd, but I feel like it's ok It would more commonly be "have polite conversations"

But nNow I just listen and I don’t follow their hectic emotions. Now I just listen and I don’t follow their hectic emotions.

Starting a sentence with "but" isn't incorrect, but if you were going to do so, I'd advise joining it with the previous sentence using a comma.

But now I just listen and I don’t followget caught up in their hectic emotions. But now I just listen and don’t get caught up in their hectic emotions.