Bra Size Big or Small?

Breasts are like belt buckles, SUVs, or the size of your wallet, they can never be too big, but as active as you are they might get in the way, also you will notice your popularity with guys will go up, girls will think your a slut, and when you grow up, people are going to think your smart, funny, and a nice person all thanks to the boobs, but your going to need a chiropractor for all the lower back pain your going to experience, Ogtogs, 100 pts for who can guess that reference, that is ogtogs

You're only 15. Granted you are exercising, but at that age you more than likely still have some baby fat. No big deal, just something to keep in mind. The baby fat should come off in a few years, after you are done with puberty. I wouldn't worry too much about their size right now. Besides, any work you have done to them now may need to be undone or redone later on and that's probably not a trauma you want to go through often.
Check with your school nurse or your doctor.

Try building pore muscle on your peck area so it burns more fat, like push ups or dumbbell flys, cool?

To be honest, the bra size isn't as important as the body it's attached to. If you have a nice body and big boobs, then that's good. I'm surprised with all the exercising that they haven't gotten smaller. Lol that's usually the first thing that goes and it upsets girls, lol. But be happy with what you have hun. I'm sure they're just fine!

Some people lose weight in different areas; I guess you don't lose it in that area. If it is physically uncomfortable to have large breasts, you can always get a reduction surgery. If you can't do that, then you should get a really good sports bra.

Are you overweight? If not, consider yourself blessed. If you have fat all over your body, then going on a diet in addition to the exercise should decrease your breast size and make it more comfortable.