Sorry that you're struggling at the moment but good on you for having the courage to post here. It's not easy getting help but you've made a good start.
As RT93 said, perhaps you could talk to your parents or a teacher, or a school counselor? Perhaps there are some underlying issues causing your anxiety/depression and eating disorder that you need to talk about?
As for your eating disorder, don't think that you are too fat! People of all shapes and sizes can have eating disorders, not just the cliche of skinny anorexic girls. Have you you been getting professional help for this?
Are there any other people that you get along with at school? Maybe you could try changing the group you sit with since you're not connecting with the current ones.
Sending you virtual hugs!