are you going to classes on campus at least? is there a student services office? there might be resources from the college to help students at risk of homelessness, which you almost sound like you are.

you say you don't enjoy computer science, but you still want to work in IT. are you sure you still want to go down that path? if you are, you might actually be better off talking to the university about emergency housing on campus and financial support or loans for students who are disconnected from their parents.

as for the money, get a bank account at a bank your parents don't use. if your $13k is in an account your parents know about, keep an eye on it but don't move it until you leave, so you don't tip them off that you're leaving. it doesn't sound like they would take it well.