Is it normal to have a huge crush on your teacher?

i'm in college, well sixth form and he's my new(ish) spanish teacher and in all honesty i didn't like him at first at all, i was quite peeved that he wasn't spanish when he first arrived. But now i actually can't get him out of my head, spanish is the highlight of my day now and i told my friends because i thought i'd be over it in a week but now they're annoyed that i won't shut up and my best friend seems generally worried for me. I'm not forming all this on the basis of an hello though, he seems to actually like me, i admit i'm a flirt but he doesn't shun me, to be fair he plays along pretty much all the time and i always catch his eye. I suppose you should know that i do have a bit of an obsessive personality and can get carried away with my mind (i'm a pisces) but it takes a while for me to get there and i really think he is attracted to me. I don't want to go into huge detail but any help or what i should do would be much appreciated, even an email just to chat about it easier would help, my friends just don't understand and i dont want them to think im cracking up, but my spanish teacher drives me crazy.