Dude, do some searching on these forums, as well as airlinepilotforums, baseops.net, and wantscheck.
Anything you'll ever need to know is in there for the taking.
The major is a double edged sword:
1.) You can study something difficult: may result in lower GPA, but you'll likely be a better critical thinker.
2.) Major in underwater basket weaving. You'll have a 4.0, but you'll be up a creek when you actually have to use your noggin.'
There are some people in my flight here at OTS that are very intelligent people, but they really have trouble with the tricky multiple choice tests that the AF pumps out there. I have had pretty decent success, which I attribute to my background in accounting. I also thank my mother for not drinking while I was in the womb and for not dropping me on my head while breastfeeding.
My advice: major in something you enjoy. These will be the best 4-6 years of your life, don't jack them up by studying something you hate.
Best o' luck.