I think UGA is pretty chill. Our current clothes fad (for girls at least) is t-shirts and sports shorts. Everyone looks like they're about to go work out. It depends what crowd you hang out in how fratty/preppy it is, but I think in general, UGA is pretty chill. I don't know how it compares to other state schools. I've heard from others that it's not as uptight as Tech, but I don't have any personal experiences.
There are a lot of things to get involved in and a lot of people to meet, so you're bound to find your niche eventually.