I will play devil's advocate and say that it might a little too early to call it quits.
As you mentioned, there is a big age gap, and you two are at different stages in life. She's in the real world and you're in school. But so what? If you two like each other and have fun, does it matter that one of you is a student and the other out? If you legitimately have a real connection, then just see what happens. My neighbors (early 30's single women) do the same thing with their girlfriends, I swear all they care about is his age, job, and looks (in that order), it's pretty shallow.
Also keep in mind that your ride in school will come to an end and you'll need to man up and join the real world sooner than you think.