I try to do exercises like running because I heard it could help shrink my cup size but I feel embarrassed because I think my breasts are jiggling and I run out of breath. I play volleyball so I'm always surrounded my perfect girls and they tell me that by breasts are too big and I can't argue. But I don't like that they are right. My back always hurts and I get rashes under my breasts. My breasts hurt when I put on a bra, but even if I could go without a bra it would hurt too. What do I do?