Lisadippolit, I think at age 14 I was a cup size b, and resigned to small boobs. Now at age 30 I am an E or F - they started growing and didn't stop (granted I am breastfeeding... before the baby I was a DD). And what everyone here says about big boobs is true... I can't wear cute little tanks, I have yet to find a bathing suit that gives enough support or coverage, shirts that button in front are totally out, and they are always in the way. But on the other hand, my son is 2 and I haven't run out of milk yet, so there is some positive to their size!
My advice - learn to love what you've got, and appreciate the benefits!