How do you overcome the guilt of crushing on someone?

I think I have a crush on this guy I know because I only think about him EVERY WAKING MINUTE of the day. The problem is that I never see him. We go to the same school but it's a big public university and I think it's weird that I have a crush on him considering that I run into him once a month at best. Our interactions are usually fairly short because while we are acquainted, we are not friends. We have no classes together nor do we live close to each other. How do I figure out a way to run into him more often on campus? And at that, how do I get over the guilt I have when I see him knowing that he was just in my head? I feel like it's weird that I crush hard on him because he is not a direct part of my life in any way nor am I part of his.