The fast-paced nature of college can be stressful, but being vegan doesn't have to be part of that stress! It will be okay if you can't maintain a strict vegan diet at all times; slipups happen, life happens.
My food choices involve many factors -- price, taste, health, transportation, distance, time to prepare and clean-up. Ultimately, most of my questions reveal that I have yet to secure a comfortable eating routine in my four years of college.
Things like pizza and soda are high in sodium and sugar and don't contribute to a healthy diet. If you are starting to see the side effects of these snacks, try out some of these more health conscious choices.