AOne meaningful experience that changed the way I think is go abroading to live abroad.

When you're introducing a *specific* case, often we say "one", instead of "a".
e.g:

"One fine morning, I woke up to find my car gone."
"One book which has helped me mentally was The Lord of the Rings"

When I was in my twenties, I thought that I had lived in my hometown for my whole life, which there areere I had my family, my friends, my everything.

It wasn't mythe place that I belonged to.

"It wasn't a place where I belonged" also works
In this expression which means "fitting in", "to" isn't needed.

I made the first trip to go abroad in my life and it totally changed my life forever.

Every person I met giave me a specific lesson and experience that were valuable for me.

"Every person I meet gives me... that is valuable to me." might also work, but they have to both be the same: both present, or both past.

One thing I've learned is thato patience is important.

I might not the best person ato doing everything, but I'm more patient toly do it again and again and again until I get used to it and master in it.

What surprised me in this progress is how difficult it was, but after that, I knew that how much I enjoyed it.

The result wasn't the most important thing, but the progress was beautiful.

I used to be shy and be scared to do everything but now I'm more confident.

No need to use "be" twice.

I'm proud of myself because I was so brave to get out of my comfort zone and becoming thee a person I admired.

"A person I admire" is usually how we say this - after all, there isn't *one* specific person you admire who you are becoming, you don't know what you're going to become!

Overall, I feel that it was a valuable experience and it helped me change my mindset, and I know that I've grown a lot.