I have a crush and I think I am infatuated with this girl, but i don't really know her, and she doesn't know me at all, we just go to the same class. How can i stop thinking about her? Details inside.

I'm a sophomore in college, and there is this girl in my class. She is really smart. I have sort of developed a crush on her, I keep thinking about her, but we don't even know each other.
Basically, after this semester I probably won't even see her again, because we have different majors (I kind of searched her on the internet), but I just keep her out of my mind.

I am kind of a shy guy, so I think it would be weird for me to talk to her, plus she already has a couple of friends in this class, which makes me even more nervous to talk to her. I just mind my own business in class. So, I guess my question is, how do I get this feeling out of my mind. How can i stop crushing/ being infatuated about her?

Sorry for being repetitive, and thanks for any help you guys can offer.