I have a crush on a teacher?
What makes you so attracted to this teacher?
He teaches really well and looks manly.
That can be acceptable, you are young and having a crush on a teacher isn't too out of bounds. As long as you don't expect anything to come of it then there's nothing wrong.
What's not fine is people. Everyone makes fun of me and calls me a pervert.
That's not very nice of them, and if they're calling you a pervert then that's a bit over the top. Most people would just expect you to ignore them and continue going on with your life.