You know what... it is very normal to have crushes on teachers especially because the authority position they are in. Also, you realize that they may not always be as old as you think. I dated a guy who could have been my teacher when I was in highschool but since I am now 22 it's not such a big difference. I'm not saying that you should go for him, that happened at our school and both the teacher and student were so embarassed the student had to be switched to another class. You're not bad at all...I had a pretty big crush for a teacher in middle school. Just try to think of them as a really good friend/mentor teachers are people just like everyone else.