I'm in my third year of college. Yes, the general population is left-leaning, atheistic, and sinful. But there are groups you'll find that are like you, that share your ideals. Find those groups, and spend time with them. Pray to God that you may stay strong to your morals, find a local church and attend weekly (at the very least).
As for living on your own, it's really not that bad. If you're worried about food, I'd recommend looking up Life of Boris on YouTube and finding his budget cooking videos. Make sure you don't skip classes, do your homework on time, and try to set up some kind of schedule for yourself, find what works for you. If you have specific questions I'm happy to answer them. Good luck with college, may God bless you and guide you in your endeavors.