CA child and her mother were ridding onthe train.

I was sitting oin the middle seat and two seats next each other just opened it.child is sit on iwhen a spot two seats away from me became available. The child sat on it, but ,her mother iwas standing.

I could trythought about standing and ask theing my neighbor to sitting on my seat.

And then, when two seats are opened up.

Her mother can sitting on seatould sit down now, but I was so nauseous ,that I didn’t have the courage to try. Normally, I would have been able to help for other people , but I couldn’t because of my physical condition.

That’s very embarrassesing.

Have I became a human even can’tperson who can’t even help for others.?

CA child and her mother were ridding on the train.

Article before a singular countable nouns.
"Ridding" means you are removing it, "riding" means traveling

I was sitting oin the middle seat andwhen the two seats next each other just opened it.child is sit on ito me suddenly became available. The child sat down, but ,her mother isremained standing.

"Was" for a past tense.
We sit "in" a seat (especially in transportation), not "on"
"just opened it" is unclear
Using the past tense for consistency.

I could try standthought about standing up and asking the neighbor sitting on my seat.person next to me to move over

And then, when two seats are openavailable.

"Open" just means you opened something, "available" is much clearer.

Her mother can sitting on seaould sit but I was so nauseous. ,I didn’t have the courage to try. Normally, I would have beentry to help for other people ,buts, but this time I couldn’t because of my physical condition.

Original phrasing is not natural English.
"for other people" → "others": Shorter.

That’s verIt was really embarrassesing.

"Embarrasses" is a verb, not the right form here. You need an adjective "embarrassing"

Have I becaome a human even can’tsomeone who can’t even help for others. anymore?

"became" → "become": Correct form in this question structure (present perfect).

I hate myself likefor that.

CA child and her mother were ridding on the train.

I sitting on middle seat and two seats next each other just opened it.child is sit on it ,her mother is standing.　△¶
¶
I was sitting in the middle seat and the rightmost seat was open. A child sat in it, but her mother was standing.　〇

I could tryhave tried to stand and ask the neighbor sitting(or person next to me) to sit on my seat.

And then, when two seats arwould be open.

Her mother can sitting onould sit on the seat but I was so nauseous ,I didn’t have the courage to try.Normally I would have been eager to help for other people ,but I couldn’t because of my physical condition.

That’s very embarrassesing.

Have I becaome a human evenwho can’t even help for others.?

I hate myself like that.　△¶
¶
I hate that side of myself.　〇

CThe child and her mother were ridding on a train.

I was sitting oin the middle seat, and the two seats next each other just opened it.child is sit on it ,her mother is standingbeside me just opened up. The child sat on one of them while her mother stood next to her.

I coultried tryo stand and ask the neighbor sitting onmom if she wanted my seat.

I assumed you meant the mom. I wasn't sure.

AndBut then, when two two more seats are opened.

Her mother can sitting on seat but I was so nauseous ,I didn’t have the courage to try.then sat down. I was so nervous that I didn’t have the courage to try and ask if she wanted my seat. Normally, I would have been to help for other people ,s, but I couldn’t because of my physical condition.

That’ was very embarrassesing.

Have I became aAm I still human, even when I can’'t help for others.?

I wasn't sure what you were trying to say. I made a guess, hoping it was still what you were trying to convey.

I hate myself like that.

You could also say, I hate when I'm like that.