"in a familiar environment, I had immigrated" That's a completely separate clause, so in order for that to work, you need a colon.
"
I'm a second class citizen" Your entire paragraph is in the past tense, but "I'm" is a contraction of "I am," which is the present tense.
Great intro, though you do use a lot of dashes, but if you feel that it is necessary (which I think it might be too), go ahead, be bold!
Again, as I said in some other kid's personal statement, make sure your essay on immigration is OUTSTANDING in both the "great" and "unique" sense, because this is an extremely popular topic.
Anna Zhu