Having a roommate can be a challenging experience. Even if this person is your best friend, it can be hard seeing them all day and every day. Feeling like you want to change your roommate is not a bad idea. You shouldn't feel guilty for wanting to live with a different person.
There are a lot of different reasons for wanting a change. You could be on one end of the spectrum, and have a roommate who makes you uncomfortable and does things that seriously bother you. You could have a roommate who eats the food you're deathly allergic to. Or it could be something less dramatic. Maybe you and your roommate just don't talk. You never see each other. Maybe you and your roommate spend too much time together. It can be hard when you spend all day hanging out with someone, and then have to spend all night with them. The first night might feel like a fun sleepover, but after the first week, it might get a little annoying. Maybe you and your roommate just don't have anything in common. You like and care about them, but you can't bond over anything.
All of those scenarios are real roommate situations that happened with people I know. All of those people got new roommates, and they felt so much more comfortable with their new rooming situations. Some say they feel more comfortable in their room so they get more hours of sleep, while others say their grades went up after switching roommates. One thing that they agree upon was that they were a lot less stressed once they finally left their old rooms.
You should not feel bad for wanting a different roommate. Your emotions come first and are more important. If you don't have a place that makes you comfortable, you have every right to leave. You can change roommates and still be friends. Your friendship will almost definitely get better since you'll have your own spaces.
But if you feel like you and your roommates don't have a good friendship, it's possible you might not remain friends after you move out. Just like bad relationships, you can break up a bad friendship. If that person isn't kind to you, you don't need them in your life. Your friends are supposed to help you, not stress you.
No matter what your reason, no matter how minuscule, it's valid. Any reason that makes you feel stressed or uncomfortable in your room is a real issue. However, it's an issue that is fixable. Talk to your RA, and they'll help guide you through the steps of changing your roommate. You need to be able to comfortable in your own room. If your roommate isn't providing that for you, then you have every right to go somewhere where you will be happy.
