Unless you shared a room with siblings at home, college will probably be the first time you have to share your own space with someone you don't know. Living alone and with someone you don't know is extremely difficult, especially coming from living with your parents.
How NOT to choose your roommate.
Don't live with your best friend from high school. Although this may sound like a great idea, you will eventually find things that annoy you about your friend and their living habits, causing fights and even loss of friendship. WAIT, it doesn't always happen like this for everyone, but at some points, there may be some tension and undiscussed problems.
Spending time at your friends house and seeing their room is a mess doesn't seem like a big deal at the time, and maybe not even when you sleep over a dozen times. However, this may irritate you when its now in YOUR personal space. Not to mention their habits may not align with yours, such as bedtime, morning routine, how loud they are, how often they clean, and so many more!
The best way to start dorming at college is to go in completely random. This can sometimes still lead to issues and maybe you don't like the person; but you could also make a new best friend who aligns with your lifestyle more than your best-friend from home would.
Treat being roommates like a Business Agreement.
You don't have to be best of friends with the person you live with. Your personalities may just not align and that is okay. However, it's good to keep things civil and respectful. Have communication about what needs to get done or things you don't like and be nice about it.
In a way, it is a Business Agreement. You have to decide on what to get for your space and how much money you want to spend on certain things (If you split it with your roommate ).
Again, having to live with someone for the first time in your life is difficult. You have to adapt to the things they like and do and they have to do the same. The best way to make being roommates work is to give the same respect you want. For example, when you wake up in the morning and they are still sleeping, be as quite as possible because on your day you get to sleep in, the last thing you want is to be woken up.
Discuss problems openly.
Honest communication is built on truth and integrity and upon respect of the one for another. - Benjamin E. Mays
When you have a problem with something, speak up and bring your problem to their attention in a respectful manor. Having open conversations about the things that bother you is great for a roommate relationship.