Can my parents make me have surgery for a non life-threatning condition?

I don't blame you.  My mother made have nasal surgery at that same age, since then I have never smelled or tasted much of anything.  And it was because she did not like the shape of my nose. Most counties have a local bar association, where you can get pro bono advice.  I was born and raised in Chicago, and know all the counties around there do.  If you are downstate, check on the web.  Obvolute your are pretty savvy on the computer.  I don't know the answer, it has been years since I practiced in Illinois, and don't know the current law, but I think at your age the judge would probably listen to you.  Good luck to you.  Stand your ground.  You can always do it later. I think that when you get that kind of feeling, go with the guts.  Something is telling you to not do it. (That was Mom advice.)