What college course should i take if i like...?

Im moving into my senior year in high school and its scaring me that i don't know what majors or minors would do with my intrests. Now i like fashion and know i will be majoring in fashion design, but in the event that fails i want to have other options. I also really love antiques and am inspired by people like Allen Haff and the American Pickers as far as their knowledge of antiques go. Are there any must take college courses or any tips to help me learn how much individual pieces may cost and what era they are from? Im really interested in starting my own business buying and selling antiques.