I am the poster boy for inappropriate crushes. Though not so much in the teacher category, more in the
they're incredibly straight or
that's your brother's best friend or
that's YOUR best friend or
they're married or
that's your boss or
that's your ex's best bud or
that is your ex you complete fuckwit territory.
@die_Sprachkenntnisse
Crushes happen. Think things through before you act, because just realize that this person could lose their job or you could be expelled over this sort of thing. It might be better to make a move when they're not in a direct advisory position to you, such as when the semester is over.
Also, I think this thread might do better in Counseling since this has such a personal story attached to it and people in GC are assholes. You might get better advice there, too. Want me to move it for you?