Fears of going into treatment and being the largest one

can anyone share their experience about body diversity in PHP, IOP and res settings? I am being stepped up as someone who has only ever done outpatient (but has been for a while) and I have no idea what to expect and I'm so terribly afraid of being the largest one in these programs. I feel like everyone else who "Deserves" this kind of treatment will be sickly thin.

I know it's irrational and doesn't matter, but a huge part of my ED is comparing myself to others and I know it will make recovery harder if that ends up being the case. (And I do want to recover).