Had an eating disorder myself . I wanted to speed up the process of gaining muscles/ refining them. I wanted to gain validation from my peers and the girls for my body; but doing so, I realized- it would never please me. It doesn't.
Honestly, it is going to be a long struggle, but it's better to try to tackle it on right now before anything serious. It's sounds easier than it actually is, but figure out all the things you like about yourself already. To you- Your body may not be first on the list, but your personality might. Recognize that not everyone has the same ideals of what makes someone beautiful. The man you marry later on will find you the most beautiful woman. Your family wouldn't care less what you look like.
If you feel pressured, I speak on behalf of some teenage boys- not all of us find Kim K or the Grande chic the "ideal".
There's more to a person than their body, and I wish you the best in overcoming this really sad problem that is overtaking the lives of so many girls.