Need help and advice please

Hi, I am a 20 year old with a left breast the size of a tennis ball and the right one the size of a satsuma. The difference is huge and this has been causing me depression to the extent where I was prescribed anti depressant medicine. I was wondering if I can go back to the doctors and see if there’s something that can be done to even them out. I’ve never showed them to my partner I’ve been with for 4 years.