Wanting smaller chest size!

I hate having large breasts. I’m only 15 and I wear a d cup almost a double d and I hate it. I look at my sister who does ballet and she has the prettiest flat chest ever. I noticed that practically all ballerinas have flat chests so is there a move I can do to make my chest size flatter, and possibly go down a few sizes. Or workouts. I hate my chest size and no matter how many people tell me I should be lucky I don’t even want to have a large chest. And breast reduction surgery is not even an option so please help!!!!