have 2 reasons of this question:
1,its the human's race problem.
2,Chinese girls and White girls have small breasts are special and different from other race girls.
and I need tell you.now 60% to 80% Chinese girls breasts much bigger than white girls. which is why fake boobs so common in white girls! the fat white girls are 34 B and look so small and super model 34 B look so small.
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if you are under 15 the your boobs have not fully grown yes or you might have boob cancer if you smoke or they might not have grown properly yet just wait and see and don't be worried :0