Best of the Village
Pick your major carefully! The major you graduate with definitely matters a lot because of the different training you get and because of the signal it sends to prospective employers. When I was in college, about half of my courses were specific to my major (finance) or at least my academic department (business). If I had not taken finance as my major, I would not have been well prepared for my first job. The same is true for engineers (how can you expect to get a job as an engineer if you haven't been trained in the fundamentals of engineering), medicine, marketing, journalism, and so on. The second factor is just as important: signaling. If you're an employer looking through a ton of resumes to find someone to hire for a marketing role, you're going to start with the resumes that show candidates who majored in marketing. They obviously care enough about marketing to make it their major, and that's good for you as an employer. So it definitely matters what your major is.
Keep in mind that you can change your major while you're still in college, if you find that you're majoring in the wrong thing. I actually changed a couple of times. But because each major has different course requirements, it's okay to change in freshman or sophomore years, but it's very difficult to change in junior or senior years. You might not be able to complete all of the courses and you'll have to stay another year to complete the coursework, which is going to be expensive. So check out the major options before you select a school and try them all out as soon as possible. If you're unsure about which major to select, spend freshman year taking a course in every field you are curious about and declare your major in Sophomore year based on that experience and the job prospects unlocked by those majors.