Welcome!!!
Don't worry - I am a carb freak too and there is no need to cut them out completely, you just have to eat the right types at the right times.
I understand that collage living is not ideal for being healthy, but there are always options. Does your hall have a salad bar? They will often have mixed legumes (beans, chick-peas etc) that you can add to the salad (well that is obvious

) and then grab some chicken or tuna if they have it...
Fresh fruit and lots of vegetables if they are available.
For breakfast then oatmeal (if that is an option), some eggs (do they have hard-boiled eggs?) and some fat-free skim milk or yoghurt would be good. Just take 4 or 5 hard boiled egss and eat one whole and just the whites of the others.
In terms of working out - I have a similar problem in that I have a VERY long day. It leaves me time between 6 am and 7.30am to workout... So that is what I do. I get up at 5.15am to go to the gym.
What time are you allowed access to the gym in your dorm? If you work efficiently then you can hit the gym from 6ish till 6.30am of a morning and still achieve your goals. It just takes dedication and planning.
What types of weights are there in the gym?