To be honest, it’s a difficult topic for me. = NO CORRECTION 

These days, I live in a different country, and I have a chance to experience racial discrimination. = NO CORRECTION 

I lived in Korea about 30 years, and never experienced these kind of things. = I lived in Korea for about 30 years, and never experienced these kinds of things. 

I just heard about it from others. = NO CORRECTION 

As an Asian, I can feel a subtle vibe when white people ignore us. = NO CORRECTION 

Few days ago, I took a bus and then some teenagers took it, too. = A few days ago, I took a bus and then some teenagers took it, too. 

They were so loud and looked they were on drugs. = They were so loud and looked like they were on drugs.

I felt little awkward and uncomfortable. = I felt a little awkward and uncomfortable. 

In that bus, I was just an Asian, so I just felt I just wanted to get off right away. = On that bus, I was just an Asian, so I just felt I just wanted to get off right away. 

So, I just got off the bus even though it was not my destination. = NO CORRECTION

Just I worried they might target me because of my race. = I was just worried they might target me because of my race. 

I know I might have overreacted, but living abroad made me realized that I could feel this kind of fear. = I know I might have overreacted, but living abroad made me realize that I could feel this kind of fear. 

Comment: I'm sorry that you had to experience such kind of fear. But you're right when you said earlier that sometimes, it's best to avoid people whom you suspect could do something bad to you in public.