Is it normal to like my math teacher?

I always fantasize in the middle of class about having a relationship with a math teacher at my school who is also the soccer coach... Is it normal that I want him to like me and have sex with him??? I feel like this is bad, but sometimes idk... Just the thought of him makes me happy. But he doesn't really know me that much, he just remembers me from soccer tryouts, but I didn't make the team... :( I like how he remembers me even though I didn't make the team, so...