Sweetie, as you get older as Greg said things will roll off your back much easier. Sorry to focus on it, but your age is a huge factor here. If someone doesn't know you and says something about your character, then that's just ignorance. Who really fucking cares what they think? In this case, if you like eyeliner and you're proud of it fuck 'em. Laugh it off. If someone threatens your person or someone close to you, then maybe. But promoting physical violence in protection of your pride is man's biggest weakness. It is weak. If you want to be a man, that is your first lesson. There is a time and a place and someone insulting your appearance is just lame.
How many rock-stars couldn't get a chick to save their lives until they got famous? Now who's laughing?
Follow yourself, not others. You're an attractive kid. Go get 'em!
As for the sex threads, it's not only icky, but not legal.