College question; auditing and sitting in. please help.?

They generally won't allow it if you're not even a student at the university (which it doesn't sound like you are). I've had friends sit in on upper level classes with the professor's explicit permission, but they were already students at the university. If you don't at least audit the class, you have no proof that you attempted to learn the material, so employers won't care. Don't waste two years sitting in classes you can't get credit for. Since you don't need a degree for your career, just start it after you finish up these first two years, then go back once you can afford it.