Do you have a normal kitchen in your home? A college residence makes homecooking problematic / impossible for many, and yet homecooking is the best way I know of to eat truly healthy.
I Found it nearly impossible to keep an exercise schedule in college until I got a couple of other like minded people to join me. I had to be creative with my exercise and be willing to do some on my own but just knowing that I had a Friday stair master buddy really made a difference.
i found that making my own food Helped me a lot when making food choices. You can prepare a healthy meal before bed or in the morning and plan for it. Planing will help you stay motivated into eating your cooked meal instead of a fast unhealthy pick up at the school cafeteria ,drive through it other. I like to think I'm saving money by cooking too and it helps because college is expensive and any little money saved can be put towards something else you might need.