I'm almost 20, she's almost 18. I'm a college freshman, she's a high school junior. Thoughts?

I’ve known this girl for a while although we’ve never been really good friends, just acquaintances while I was in high school. We’ve been talking a lot lately, and things have been going good. She’s not the average high school girl (catty, dramatic, immature).
I personally think if we were to date, things would probably be good between us compatibility wise. I’m just afraid of being tied back down to high school stuff, and the possibility of a long distance relationship if I go away to college in the fall. Also, the “I’m in college, and I’m dating a junior/senior” thing.
Any advice would be helpful.