How to pick a career?

College is fast approaching. . .and I don't know what I want to major in. How does someone pick a career to do for the rest of their life when they've only lived for 18 years of their life anyway? I thought for the past two years that I wanted to be a wildlife biologist and work with endangered species because protecting life is important to me and I feel very pionately about species and extinction. But as my senior year of high school begins, I've realized that there are two very different sides of myself. One is the wildlife research nature type (although I've never been a hunter or fisher or such), but the other side. . .I have always had a strong desire to live in a big city and go to work everyday in a nice skirt and top and have a personal office where I was respected and successful. . .So what do I do? Do I go to college to be a wildlife biologist and have a career which I end up hating because I prefer cities instead of countryside? Or do I try for a business degree and move to a city and regret leaving the small town life I've always known?