Firstly, don't get your braces off until your teeth have moved into the right place.you don't want bad teeth your whole life, it'll really come back to bite you.
Secondly, I actually find girls with braces cuter! (Maybe I'm weird?)
Most guys don't care at all. Maybe if they had a bad experience with it they'd care, but eventually they'll get past it. If a guy is that judgemental about a girl having braces then it might not be worth it to get him to like you. I hope this helps good luck!