Hi QT,
I'm a guy and I really mean it when I say that I would not be put off by a girl in braces, I actually think they can be really attractive - it shows that the girl takes pride in her appearance and is confident enough to make a big decision to make themselves more content and happy.
I can imagine it must be a bit awkward, but to be honest I'd just forgot you have them, if he asks you or you see him maybe look at your teeth then bring it up! If he is worth anything at all he will be totally cool about it, I would never expect anyone but a total idiot to have a problem with anyone in braces. He should like you for you, not for what you have in your mouth!
Just be yourself and be confident

Those are the two most attractive traits that a girl can have (After braces, hehe).
Good luck!