What should I major in at college?

I'm an incoming freshman and currently undecided. I had great grades and test scores in high school, but I really haven't found out what I want to do with my life. I wanted to be a Psychologist for a while, but don't really want to since the field is overpopulated, and my church counseling cousin advised me against secular Psychology. I would love to be a fiction author, but I realize the odds aren't good for that. I'm going to a liberal arts college, and I don't really have a subject stand out at me since I'm the definition of well-rounded. I do well in math, science, English, and lots in between. What should I do?