How do you unlike someone?

Okay so, college just started, and I find myself liking a blockmate of mine. It's honestly stupid. I'm the block representative and I want to keep my academics life professional, so this is such a headache for me. I think of him often and I find myself always looking at where he is. I don't really want to like anyone romantically, especially not someone I have to see almost everyday for the next 4 years of my life.

I have never liked a classmate before because it's just not it for me. I also rarely fall because I find romance unappealing. But this one, Idk what this dude put on me. Everytime he smiles, it makes me feel so happy like an airhead. I barely know the guy, but everything I currently know about him pulls me in. I don't think my feelings are that deep yet, but it's already a big problem. Please, anyone help.