[hannah]

Hi, I think push-ups to work on the muscles surrounding your chest might be a way to change the uneveness in your breasts.
Squats might help for the back..whiich in turn is attached to your chest as well.
Our shapes are all defined by muscle...nothing more...It is not lop-sided bone its the muscles causing the asymetry.

Goodluck!

*quick edit: Patience is key when working with muscles, dont expect results too soon.