Is it possible for no one to have a crush on me at all?

I'm currently 22 y.o. and I have never been asked out, pursued, approached & no one has ever showed any signs of interest before. I've showed interest in my crushes but none of them liked me back and I was never their type. I currently attend college but it's a commuter one so everyone goes to class and goes to work or home afterwards.

Can anyone else relate to my issue? Is it possible that I'm just too ugly for the guys around me or guys in general? I'm quiet, introverted and reserved & have always had a small group of female friends throughout my life. I went to school with another girl who was quieter than I am but she still managed to get a BF so I'm guessing that my looks must be the issue?