What to do with unexpected love?

I met this girl in college a couple months ago, and wow. I've been single for three years, but I haven't felt this way in ten. We get along soooo well, and I love everything about her so far. But I am hesitant to get into a relationship with anyone because I've been cheated on and I don't want to fail at love again. My real concern is that I may be over analyzing our potential for longectivity by looking for things that may cause problems. First of all there's the age difference. She is 21 and I am 27. Five years, four months and fifteen days. Then there's the fact that she's moving an hour away this fall for school. One hour - not so bad. But here is what worries me most: she's kind of average looking and I hardly feel any kind of physical attraction toward her. Not that I look like a Justin Beaver, but I worry that she won't always be pretty enough to keep my interest. Im just trying to be realistic here, please don't assume I'm a shallow jerk. Really though, I am falling hard for her personality and she IS pretty, just not what I am used to. We've been on one date; doing a second tomorrow and I can't wait. I cant sleep. I can't think of anything but her. I just want to know if anyone who has been here can give me some direction. The last thing I want to do is hurt her or waste our time. What are my chances of having a lasting relationship with this girl (assuming that's what she wants too). Gosh she is lovely...