Can anyone answer these exersise questions?

Hello!

Okay, well I'm 14 years old, and I was wondering whether mild exercises (squats, lunges,etc) would decrease breast size? I know cardio will, which is why I try to stay away from that, but will squats and lunges? I'm not trying to lose weight, I'm trying to build muscle.

You see, I have a flat butt. It looks big from the side, but when I wear jeans, it looks flat from behind. So since mid-January I've been working out, doing squats, lunges, sit ups, etc. I've also given up on most junk food like chips, soda, cake, nutella, brownies, etc. The only 'junk' food I eat now is a scoop of chocolate ice cream twice a week, and one cookie for lunch every other day. I want to see fast results, is there anything I can do to speed up the process? I do 100 squats a day, 20 lunges, and 20 situps all in one day. So can anyone please recommend a healthy diet and exersise routine which will help speed up these results without losing my breast fat? I'm a 34B now...