Im obsessed with this guy and I feel like a stalker

Im obsessed with this guy to the point of stalking him and I cant take it. Im studying on my the campus library and I have to move cause this guy I like was there and I couldn't focus. Like hes 100 feet away from me and all I have to do is look up and see him. What is he studying? Hes on the phone, I'll try to listen in. He's taking a break, where is he going? Then his stupid friend showed up and thoughts about how he didn't tell me he was meeting a friend, never offered me the option to join them, and how he'd rather be around other people over me. I feel crazy. I dont want to be that person but every time I see him it sparks this insane passion and need in me and I cant take it anymore. How do I make this feeling stop? How do i not become this crazy stalker from like movies or whatever.