Is it worth it to get attached to someone that you know you can't be with?

This guy and I have been talking, hanging out, and basically dating for a few months. The problem is that not only do we live two and a half hours away, but I am leaving for college at the end of August. At that point, we will be about four hours away and the relationship will most likely have to end. I want to leave with no attachments so that I can get used to being away from home and start out college in the right way-since I’ll be there for six years. To make matters worse, there’s a five year age difference and I basically can’t tell my parents that we’re seeing each other. Up to this point, I’ve been trying to stay as detached as possible, but I’m wondering whether I should just give in and have fun for the next four months. I don’t really want to be hurt and getting over a forced breakup when I first leave. I like him a lot, but don’t know if I’m getting in over my head. Plus, there is so much change going on in my lifewith graduating, starting a new school, and moving four hours from home that I don’t know how I can handle any more big commitments. Any thoughts?