Uni rocks!! It really, really does. There's nothing like living on your own, I tell ya! From a Britisher's point of view, mind...so I have no idea how it differs from your high school or whatever... BUT it IS extremely different to college, and any other mode of education you can think of, too.
The hardest part, I'd say, is adjusting to not having teachers yelling at you to do work. All they say is "hey, it's your degree" and then I go "fuck! I should NOT procrastinate so much" and kick the internet.
But yes. Uni = aceness. Enjoy! ^_^