Living with another person is quite difficult especially if you have always had a room of your own at home. Sharing space with a complete stranger requires patience, and mutual understanding as it won't always be possible that you will see eye-to-eye on all matters. It's a huge adjustment on your part but the same could be said for your roommate as well. You don't have to put on a fake facade to get along or be the best of friends but a basic understanding will help both you get along to make your college lifestyle easier.
Both roommates should be aware of each other's adjustment process they will go through while co-relating with different living habits, communication needs, recognizing quirky habits and expectations. If you are the first one to arrive in the dorm room, set up your bed, arrange the desk and closet. Check the furniture and the common provisions available say a microwave or coffee maker. Don't just start using it as soon as you arrive. Wait for your roommate to offer her the first choice of using the appliances, but also make it clear that the last person using will clean if it's dirty. That way it looks like you are not strangling her preferences though both of you are sharing it. It is a basic code of respect which most students follow, but obviously there will be exceptions.
Once both of you have settled and studies are in progress, be considerate of the other person's daily routines and habits. Your roommate may want to sleep late as class timings are scheduled later in the day, but you are an early riser. Make sure you tip-toe quietly of the room to avoiding waking up your roomie. They will likely reciprocate your gestures the same way. Another way is tuning down the music volume while your roommate is studying or spending on headphones if he or she is used to study with music on. Also, if your roommate is studying and the phone rings then step out of the room to talk. This would help them concentrate on their studies while saving your privacy also. The same respect is applicable while calling friends over. Decide beforehand when and how many friends can be invited to avoid later misunderstandings.
Your roommate and you may not be on the same wavelength, but sure can adjust for a relaxed college life.