Oh, and you can go to college while you're in. In fact, I'd recommend enlisting, and doing some college work while you're in and apply for the Naval Academy - there are programs for that in the Marine Corps. The cutoff age for getting into Annapolis is 22 I believe, and all it takes to get in through the program offered is superior physical fitness, dedication, and you'll earn the recommendation letters that will make you look good to the guys who decide who gets to go to Annapolis. Of course, you can't be a rock either, haha.
I saw you're in Tracy, you should head down to the Livermore recruiter, they'll hook you up. :-D