Fuck I think this girl thinks Im a stalker

she's in my history class and hot as hell. i fucking got drunk and found her on facebook and sent her a message like "hey youre in my history class... dont know where i was going with that, but hi"

she sits next to me every day but probably a bit out of my league and i havent talked to her irl

Just tell her that she's not your type, and give some banal reason why (too much make-up or something).  You'll know if she might be interested in you if the next time you see her she's wearing less make-up or something.