Is it normal that i want to bang my english teacher?

So this teacher has been in my school for a while and I had his wife as my English teacher a few years ago, but i never really noticed him. At least not until this year. He's my english teacher, late 30's-early 40's, has a few kids, and is married.
At first I just thought he was attractive.
But this is really starting to turn into an obsession.

He's witty, smart, funny, and kind of a dork. I can't pay attention in class because I'm too busy looking at his ass or how great he looks in the sweater he always wears.
I only try hard in that class to impress him.
I found his facebook and look at his pictures sometimes.
I stay after school even when I don't need help just to be alone with him.
I have dreams about fucking the shit out of him.

No, sadly I would never act on any of these impulses obviously because I'm just a horny teenage girl and he could lose his job but I'm just wondering, is this normal? To this extent? I've had crushes on teachers before but they were never this intense.

I'm also starting to only be attracted to older men in general. I'm only 18 and I don't find many men attractive until they are in their late 30's?

Is this normal?