Hi! Are there grocery stores near your dorm? Is there a kitchen in the building/your suite? and will you have access to a fridge? If no fridge, I would recommend renting/buying a mini fridge. They're not incredibly expensive and well worth it if you want to try to eat healthy while at school. Otherwise, you are at the mercy of the cafeteria's offerings. I lived off of caf food for 2/4 years and there was always grilled chicken and they had a vegetarian section that offered a decent range of veggies. If your caf has anything like that, you can probably pull it off, but you won't be eating quite as cleanly (not knowing what oils they use, for example).
Also, congrats! It sounds like you're doing really well so far. Good to know that it can work even with a desk job, I just started a primal trial (really just trying to get the meat/fat to veggie ratio right at this point) and I work an office job 40hrs a week.