Network, Network, Network - As an incoming freshman, you will most likely either have:
- No idea what you want to do with regard to a major
- Know exactly what you want to do but change your mind
Both of those things are totally acceptable at many colleges. The best way to figure out what really interests you is to try everything. For me, my Freshman year was one that I spent being somewhat anti-social and passing up many opportunities. Don't let shyness or close-mindedness keep you back from finding what you love. If you see a flier for something that sounds interesting, go. If you feel like you should talk with someone, do it. Get to know your professors because they are not only great friends but wonderful contacts for all kinds of opportunities. You might find that certain majors attract certain types of people. This can help you make your decision.
I say network, but that makes it sound more "professional" than it really is. You can envision it as making friends or making contacts, but either way it will make a huge difference.
Be a good student because it gives you options that bad students do not have. Ideally, you will find that you are drawn to certain areas and activities. pursue these things and your major and career will mostly take care of themselves. Don't forget to have fun!