Is it normal to have a crush for my english teacher?

I have a teacher who's been teaching me English for four years. I always performed well in his subject until now. During the first year that he was teaching me in...i just took him as my favourite teacher but all these remaining years...things changed. I started dreaming about him and found out later that I really love this teacher. I don't know why this is happening because it's a lot embarrassing. The worst of all is that he's married and he's twelve years older than me..this is so ridiculous! Why does it happen to me and why now? He's always in my mind and I think that's the only reason why I no longer fall for boys my age. Why? Just imagine how much it hurts to love someone who's not even aware of that. I just wonder how I could just get over this. Please help...