Not all professors are the same. Not all universities are the same. If I was in your shoes, I would try to transfer to a different and hopefully better university. Yes, most of what they teach is archaic, impractical, and more theory than practice. With that said, assuming you live in the US ("college" instead of "university"), getting a bachelor's degree is an important credential to get especially if you can get it in CS. I would only consider changing majors if you believe, you just cannot succeed with CS.

If you attend a public university, most states require the universities to disclose "grade distributions" and sites like ratemyprofessors can give you a hint of which university/professors are good or are just horrific. The grade distributions will tell you the letter grades each professor gave each class. I.e., a university/college has the same admissions standards; if two professors teach the same class but one consistently gives Cs while the other consistently gives Bs -- as the Dean of the college or a student, I would be upset.