I can't stop gaining weight
Why are you gaining weight?
When I get stressed, I eat too much junk food.
I'm sorry that you're always stressed. Stress eating and gaining weight when you don't want to are not great. Maybe you could talk to a counselor or another friend about better ways of dealing with your stress.
I know... My fat ass is too stressed to control my food intake.
It's normal to eat some junk food when we're stressed. But if you're doing it so often that you keep gaining weight, it's time to seek out help in finding healthier ways to deal with your stress.