S.R.
I envy you...my breasts started at a full C (which I would have preferred smaller)...after pregnancy they are now a D and a full D at that. I hate it! They get in the way and they are out of proportion with the rest of my small frame. I'm only 5'1" and weigh 118 lbs and I have this huge chest. I would be happy to trade with you. Working out is a problem, even walking fast leads to bouncing. My clothes are a real problem too. I also hate when people just look at my chest when they see me. Ugghhh...
The only thing you might do is push ups to build the muscle so they appear perkier.
Enjoy what you've got.