How Old Do I Have to Be for Nipple Correction Surgery?

I just turned 16, and my bra size is 32a (not sure if I can get the surgery despite my size)Both nipples are inverted. Not only am I insecure about them,but i've noticed a white cream-like substance comes out from both my nipples. It's sticky and does get stuck on my bra so I have to get a Q-tip and clean it. It comes out enough to bother me. Also, the insides are very sensitive and there is usually discomfort when wearing certain bras. (i have to wear a certain fabric) Thank you for reading. =)