When I had anxiety/depression so bad that I physically hurt and didn't want to live, I wanted to be someone else, too. I looked at all those 'happy' people around me and I wanted to be THEM, not me. I prayed for an exorcism but it didn't happen. I finally had to do the work (with help) of accepting myself, even with mood problems.
Self-acceptance and self-compassion are cornerstones to a good life no matter who you are or what your issues are. Here is a link to a TED talk on self-compassion by Kristin Neff that I found very helpful.
https://www.google.com/url?sa=t&rct=...3,d.cWcpassion