You're only 14 but already a B, you should consider yourself lucky. When I was 14 I was barely an A. Now, at 22 I'm a C. I didn't even start getting what I got till I was 18.
Be happy with what you have and love your body. i am 24 i am a 32A i'd be happy to have what you have! you gotta love yourself and it's not all about size!