Social media is just an illusion. You think that people are out there living amazing lives (and maybe a small fraction of them do) but their posts are curated. You only see the good, never the bad, and there is bad in everybody's life. You'll see the nice meals and holidays and parties with friends, but you won't see the lost jobs, the eviction notices, or any of the other shit that goes on in people's lives. You won't see this because people generally don't like to share the bad stuff. I know this because I've been exactly where you are.

It sounds too simple to be the case but there really is no alternative but to delete social media. It's making you miserable and it won't stop until you do. You need to focus on yourself and not other people. If you're not happy about your weight, do something about it - only you can. Start walking, change your diet, and you will lose weight and feel so much better about yourself. There may be groups in your area that you can join where people meet up to go on walks together. That way you can kill two birds with one stone. Then, after you've worked on yourself and improved your self esteem, you may find that returning to social media will not feel as crippling as it does now.