So, you go to Uni and presumably live in halls. At worst (?) your mother does go and live in the same town/city. She'll have to get a new job I guess and find somewhere to live - going to be difficult. Will she be able to find a place to rent? or buy - just when she needs to?She may have to leave any friends she has. She may well find that it's all too difficult.
You will not be living with her, at any rate. You will be having meals with friends, going to lectures, having a social life. I expect you will have a much improved life , new experiences etc. you will not be living on top of each other any more.
She is no doubt afraid of living alone and will miss you a lot. You should be aware that it is often a traumatic time for parents - especially mothers, when their children leave. Parents often say that their children don't love them like they love their children - unconditionally, for ever. I think at some stages in life , that's probably correct. You are at an age when your instinct is telling you to strike out on your own and become your own person. That's what children are supposed to do. Your feeling that your mother is suffocating you, is controlling etc. is normal. It's a necessary part of growing up.
Strangely, once you are grown up and have stood on your own feet for a few years, you gain in confidence and no longer feel that your pareints are criticising you. Your relationship may suddenly improve no end. You will be happy to relate your goings on to your mother, include her more in your life. She will lose her anxiety about your growing up and feel more relaxed.
And, then finally, you have children of your own and suddenly you understand how your mother felt, why she seemed so unable to detach herself from you .
One last thing. You only ever have one mother. She may be the only person in your life who you will always be able to count on - the only person who will always have your best interests at heart . ( However unlikely it may seem to you now.) Don't burn your bridges with her - you may need her sooner than you think.