Help with breast growth/structure

Hi, f 18, I have been insecure about my breasts for a long long time. They are in between an a and b cup, somewhat oddly shaped and somewhat far apart. I've heard that exercise can firm them up to at least some degree, but are there any other ways I could make them look at least a little larger (not from a bra)? I've heard that some supplements containing photo estrogens might help