I'm 18 and still only a B which can get me down, although past boyfriends have told me they like them and unlike some friends who have double D's, I'm able to wear certain tops that they wouldn't be able to.
I think everyone wishes they had the opposite of what they do have, but I understand your frustration. Just learn to be happy with what you have; if they grow more then great although if they don't then don't worry about it - there are always pro's and con's of anything; with your boobs insecurity just focus on the pro's.