I find actively working on thinking good positive thoughts about myself doesn't work. To contrived, I agree with the other post that says positivity comes as a by-product of the other work we do.

For an example, today I was out shopping and felt ok and pretty relaxed. I suddenly became aware of to loud voices coming behind me laughing. I noticed that it didn't effect me, I noticed the absence of usual feelings I would have such as, feeling they MUST be laughing about me. I just felt "normal", I just thought I guess they're having a great time shopping. I walked on feeling ever so "together" and positive lol..

If I had said to myself before I went out today, that I am ok and not to worry about what i think others may think of me, that wouldnt have worked.

Hope I made sense?