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You live in America, so you'd be hearing American Accent a lot. That's why it will suit you best.
Most schools in non-English countries don't have native English teachers. So, they don't really teach Accent. It is Spelling and Grammar or Structure and that is a separate subject.
it depends on what language accent have you been expose more often.
for me it's easier to learn american english than british english.But it's up to you,which one you want to choose for learning
it's not a big deal for me to learn varieties of English either British or American as long as it's still mutually intelligible. I agree with @Mike I come from a non-English country where most teachers are not English speakers, they did not teach us American nor British accent, thus I still speak English with Indonesian accent which sounds quite awkward.
You said " i wanna be" , I know this is American slang , Maybe I am wrong though . So, I think you already speak little American , so to speak.
I prefer British! But American is easier to learn. I would say just focus on the language - dont worry about the accent, it will come naturally :)