I'm 21 years old, 115lbs & about 5'4''. Since I was 12 I've been an AA cup. What should I do? (Photo)

I'm 21 years old, 115 lbs and about 5' 4''. Since I was 12 I've been AA cup which is so damaging to my self esteem because it makes my body unproportionate , my upper half looks childish,and I look terrible in clothes. I want to look my age . I'm thinking about a boob job but since there is little breast tissue is it feasible to go from an AA cup to a B without looking fake? I just really hate the size and shape of my breasts.

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