DON'T get a boob job. It's a massive waste of money for something that isn't nessary. Fake boobs look wrong and out of proportion most of the time.
Most boys don't care what boob size you have as long as you have got some that are real and a nice shape. It's hard for small boobs to be a nasty shape anyway. You don't want to date shallow people who will only date those with what they consider 'big' after all.
Hell I'm a B and have dated a guy who liked ridiculously large, bordering unrealistic boobs but still preferred real to fake any day. I will admit that was one of the reasons I ended the relationship (long story) but he still asked me out and we dated for a long time.
Also your weight and frame contributes a lot to it. I have a small waist so my boobs appear bigger than what they would on a fat person.