I had never learknedw that I am the lowest rank in the world.

Lowest rank of what? Did it say that Japan is the most, or least racist, or that Japanese experience the least/most racism?
"know" is better for small bits of information, like a single fact

DoAm I involve withpart of the hierarchy?

Moreover, Am I at the lowestbottom?

"bottom of the hierarchy" is a common wording
However it has a negative connotation, which wouldn't make sense if you mean that Japanese experience the least racism

I noticrealized that I'm in good circumstances.

"notice" is more for things that you realize at the moment of seeing/experiencing something, rather than realizing something by being told by someone else. "notice" also has the feeling of something that's immediately obvious to you the moment you see/experience it, whereas you can be exposed to something several times before you "realize" something about it
Natural: "I noticed she had an accent."
Somewhat unnatural: "I realized she had an accent." (implies you did not realize it in the beginning)

I have a dream of studying abroad, but I'm scared fairlyfairly scared.

I have noeither a strong mental, orind nor lainguageistic talent.

Of course, I don't think that all information areis spoken from a neutral view.

DoAm I involve withpart of the hierarchy?

I have a dream of studying abroad, but I'm fairly scared fairly.

I have no strong mental, or no lainguageistic talent.

Of course, I don't think that all information arewas spoken from neutral view.