How do you control overeating when there's so much food around?

Control environment. You need to get out of your toxic environment, get rid of the crap. Ask your friends and loved ones for help. Get out of the fast food line now. Your life depends on it.
Eat to live. We can eat to live or live to eat. If you know how to stay healthy no matter what you eat then it is ok. If you create problems in body by eating whatever then the only thing that needs control is yourself.