What should I be focusing my studies towards majoring in?

I am an 8th grader at a high level college prep school. This year, teachers told us to pick our dream school, and I chose Brown University (Providence, Rhode Island). I know that it is a liberal arts school, and i am inclined towards such majors. I have always had an interest in writing and theatre, but i am concerned about the monetary gain of these specific job options. Basically, i don't want to end up bussing tables with my degree in those fields. I guess I'm asking if I should follow through on my dreams or major in something more practical. Any help would be great. Thanks!