How far are you in high school? While it is very true that college is not for everyone and is a personal decision, I would highly suggest taking that path (I'm currently a sophomore at PSU). If you really are sold on dedicating your life to magic once you graduate from high school I would recommend earning a degree that can land you a definite job if your magic career goes sour.
However, to answer your question pertaining what major(s) would be good to accompany a magician there are really a lot of answers. Majors in the business world such as marketing, management, etc. would serve you very well. Also, majors in communications and public speaking would be beneficial. Thirdly, majors in theater and the performance arts would be very helpful. Heck, I could go on with different majors that would suit a magician in different aspects.
The point really is that there isn't a specific degree that is essential to future performers. If you choose to continue your education at college, do yourself a favor and get a degree that will work and provide fall back if things do not work. If you still want to become a professional magician, pretty much any degree will help you out, also you could then pick up a minor in communication, business, performing arts, psychology, etc. if you desire.
My path is not to become a professional magician, but I have a similar fall back plan. I am on track to receive my degree in Secondary Education (a degree that can land me a job), and then may attend law school post-graduation. If I bomb my Barr tests, or if law school just doesn't work out, I have a workable degree to fall back on.