Hello sadkoala47: The Skeezyks isn't really of much help when it comes to offering helpful suggestions.

He tends to have the reverse of the problem you describe. It's not so much that he thinks everyone is against him & doesn't want him around... it's more that he's against everyone else & doesn't want to be around any of them...
Of course the obvious suggestion here would be individual therapy or perhaps a support group. I presume you're aware of these options & perhaps even already engaged in them. I don't know anything about your day-to-day life, of course. But would it be possible for you to become involved in doing some volunteer work of some sort? Helping others is typically seen as a great way to feel better about yourself. Perhaps it could help you to begin to feel more valued... just a thought.