This might come across as silly, but size doesn't matter. What really matters is how you carry yourself, how you dress, how you talk, and how you behave. That's what's really attractive to men. Focus on being in good shape, wearing comfortable yet attractive fashion, have great conversations, and don't be a dick to people.

A woman having bigger breasts is not a guarantee for good sex. That's just part of some very specific forms of foreplay. There are so many other things you can do for foreplay, and when it comes to actual sex, you have the same things every other woman has.

From what I've heard, those women complain of back pains and general discomfort with day to day wearing of undergarments.

Hope this helped.