Well, Im not sure of that many ways to actually boost the growth of breasts, but i do know that large breasts are vastly overrated. Ive dated alot, i mean a lottt lol and all my ex's and all my guy friends have confided that they would almost rather a lean body with a handful of breasts than to have these huge things in the way all the time.
Most guys are more into a smooth body, excluding the few 'boob-guys'.
Dont worry... besides you sound pretty young, give it some time, and drink your milk!
