Boy problems..........?

I've been really depressed lately. I have these indescribable feelings for a guy that's in my program at school. I can't stop thinking about him and it kills me to even think of him being with another girl. We talk occasionally on the phone but it's mostly about school-related things. We only hung out once outside of school. Everything about this guy is great and it's so easy to fall for him...but he's 5 years older than me and he's really smart and hilarious...and I know he's probably looking for older women. I'm 20 and he's 25, but from what I've heard, his girlfriends have been much older than him. I feel like there's nothing I can do to get him to ask me to hang out...like I'm just this 20 year old in his cl that he gets along with. I really hate having these feelings of worthlessness...sometimes I'll just break down and cry because I feel like I could never be with him. I don't know what to do....I just wish I didn't have these kinds of feelings...it would make life so much easier. If you have any advice for me, please share!! I need all that I can get.