How to reduce the size of your breasts?

I'm skinny. I weigh about 130 and I'm about 5'8". I have big boobs, and I don't like them AT ALL. I play volleyball year round. However, that doesnt make a difference. I was wondering if I started to run a half a mile to a mile every other day, would I start to see a difference in the size of my breasts? I'm around a B/C cup. I'm not totally sure. How small would they shrink or reduce? I would run, bike, and swim (while still doing volleyball (we have open gyms 2 days a week and we condition the other 3 days). Thanks!