In general, I think it's best to wait until you are at least 18 and your breasts have stopped developing before considering any kind of cosmetic surgery. You sound as if you would be a good candidate for a breast lift or reduction, but they could still be growing and this would ultimately...
One way to judge this is to see whether weight loss affects your breasts. Large breasts can have a large fatty or a predominantly glandular component. Fatty breasts will usually be more sensitive to weight loss. It is best to be close to your ideal weight before surgery but unfortunately large...
If you want to upsize "a little", 50 cc is like adding a small padded bra. You can fill a ziplock with 50 or 75 ml of Jell-o or rice (not sure why these are good but my patients say so!), stuff your bra, and see if it looks worth another round with the knife.A little perspective- you increase...