Yes, what UC are you going to? Every one has a different flavor of music department. Also, you don’t need to declare a major at most of them, or even can’t, until end of sophomore year. There’s no reason you need to major in music to write the kind of music you want, or to do music production. You could get involved with friends who have bands as an extra-curricular. Study something else that you actually want to study - if you’re not interested in music history, theory, aural skills and musicology. (The academic study of music at most of the UC’s.) You must be a good student to have gotten admitted to a UC - however, if you have no interest in academics at all, maybe you should withdraw/defer after the first day of class - and take a gap year to find out what you really do want to study. (You need to enroll and be there for a day to defer, I believe.)