Well, your first two years are going to be basic stuff anyway. So just relax about a major and focus hard on hitting all your prereqs hard so your qualified for anything you want to do.
Don't let math get you down, though most people are afraid of it, Math is actually the one subject anyone can understand, just so long as they put i the hours.
Try and think up a few questions not on the test that shows a future interest or shows you understand the subject and ask the professor after class. They LOVE that and it helps networking wise. I qualified for some great grad school level independent studies because of it. Grad school like practical experience that counts for credit and is actually easier then a class? Doesn't get better then that. I also could of gotten into some good grad schools as a lock, just thanks to the strong support of a couple important teachers. They can REALLY help you net internships and the like as well.
It bugs profs if your constantly bugging them about basic stuff, but if you can show yourself to understand it, and be insightful, they'll go out of their way to help you.
If you are one of those "Naturally smart" people who never had to study much... take a class in studying and practice studying. Chances are at some point you will need to learn to study unlike Highschool, and the transition will kill a grade in a class or two if your not careful.