No offense but I don't accept that reason. Even I'm in school, the canteen food is junk! You can always carry a healthy tiffin.
Eat every 2-3 hours
Drink lots and lots and lots of water.
Do cardio, it will be tough at first but later ull enjoy it.
Use a measuring tape to know all your measurements because some people lose inches first and don't lose weight, so don't get disheartened by it because muscle is heavier than fat.
You will HAVE TO CONTROL your temptation in college e every single day, that's what I'm doing in school.
Hope this helps!!! :-)
I am the same way... . But I don't make that as an excuse. . I pack my own lunches or bring snacks like apples or fruits to keep me going. .