I hate my boobs.

Hey y'all! I need help! I'm 15 and very active, but I have a problem. My left boob is a size A, while the right is a D. I have to buy D size bras and fill the left side with what are supposed to be push up gel things (that you get from like traget or whatever). When I excessive I use my regular bra and a sports bra and it always hurts. Half of my back hurts, and it's getting to the point where it is visually noticeable. Mom and Doctor think I'll grow out of it but I'm afraid of getting intimate with boys and scaring them when my fake boob falls out. HELP.