Hey, welcome! I'm not a 20 something mom either
I know a lot about being a big teen - I was one. Was a big kid too. I did manage to have a boyfriend once and get engaged, but it didn't work out. Otherwise..I'm no good at dating since I don't have much confidence in myself.
Im sorry your folks treat you that way. Do you have friends to turn to? That way you can get some support that you aren't getting otherwise.
I do that too when I'm feeling down sometimes. It goes either way - sometimes I don't want to eat at all, or I want to chow down.
I'm reading a book about changing your food thoughts. Maybe something like that would help you be less of an emotional eater? I hope it works for me. It's called the Beck Diet. It's not a diet - it's a 6 week program with daily thinking exercises to help you change.
Good luck. You can do it!