I have told them a million times about their negativity and constant belittling but they continue to do it. They just aren't conscious of how their behaviour affects me so badly and they make no effort to try and notice it or change it. Definitely helicopter parenting as you said. Sadly, I would still keep contact with my parents once I move out but I would want to limit it to either once a week or once in two weeks. I just want them to let go of me and stop seeing me like a child. No matter what I do, they can't see me like an adult because they shut down every opportunity I have to show them I can be. Even if I got the chance, they still think whatever I do is not enough. Essentially belittling like you said.

Thank you for trying to help me out though. I really appreciate it.