ShannonLibby pretty much summed it up. Let me tell you, pretty much everyone getting ready for the fall feels the way you do. I just finished my second year but I remember being extremely intimidated the first few days of school because the profs were kinda scary, the reading was really hard, and everyone around me seemed so intelligent. Even during some of orientation, I had the feeling of "what am I doing here?" I think it's natural to have doubts about actually going, if you're going to succeed, etc. But you'll never know if you don't give it a shot and there's nothing that says you have to stay after first semester if you decide its not for you.