1. Keep an open mind.
2. Know that you two don't have to become best friends.
3. What doesn't kill you will make you stronger.
4. Be prepared for any kind of person.
5. Be the roommate you want them to be to you.
Going "blind" is a huge step toward your new life away at college, which comes with certain responsibilities, but it can also be fun. Don't completely write off your "blind" experience, and decide that it's going to be completely miserable.
If you allow yourself to get used to the new living situation, and actually give it a chance, it could have many positive effects.