Crush on my teacher help?

I am 16 and I am in love with my teacher like absolutely infatuated with him. He's not super good looking (he's not ugly though) but he has this great personality. Here's the creepy part, he's not young he's like 43 but everyday I try to talk and flirt with him and he jokes around with me too and I love it, it makes me so happy. I know it's gross and wrong but I feel like if I was given the chance I would have sex with him. Is this normal!!!?