What should I do!?

Okay ladies, I'm 15 and although I'm not really looking for a relationship I can't help to think about it! I honestly think I'm too young to be dating but i can't stop thinking about what it's going to be like when I do. I'm very mature for my age, that's probably why I get along so well and are attracted to older men. By men I don't exactly mean 45 or 60. I mean about 19 to 34. I know I'm not suppose to be thinking about men almost 20 years older than me, but it kind of gets me hot. Which actually sucks because I'm attracted to my 28 year old teacher and it's killing me not to make a move! I know it's illegal but I think he's kind of into me.... Even if it's just a kiss or something that can help me make my decision whether or not in attracted to him? I don't know if it's my hormones or not but I can't stop sexually thinking about him! And people keep telling me to just forget but I can't, I have class with him every day!