I have constantly been "busty" for my age range. I started off being a B cup by the end of year 7 ( aged 12) to becoming a double D by the end of year 8 ( aged 13) by then i was convinced that they would stop growing but now I'm 15 and I'm shamefully a size 34G. It worries me whether they will stop growing or not and I wonder whether i can reduce their size naturally.
You must have begun early! I started developing breasts when 9, like you I was a B when 12, and a D when 14. Fortunately they stopped growing then . For me it's really genetic, family and also ethnic thing, so I didn't feel shame because I wasn(t alone and the other girls whre actuelly jelous. I'm 21 and I'm fine with them though they sag a lot. But my younger sisters are 13, 15 and 18 and only the youngest has no breasts yet but the others are both E and they have major problems with their backs because of the weight. I hope you will not have these problems.