17 year old guy with gynomastecia (manboobs from excess estrogen). What can be done?

I've heard exercise, but it doesn't seem to be working at all for me. As I build more muscle, it just pushes them out further and doesn't seem to get rid of the breast tissue. Are there any medications I could take? I'd talk to my doctor about it before I start taking anything, but I'm trying to figure out what my options are right now.