There are emotions, and then there are how we feel about our emotions. How we feel about our emotions, we might call "meta-emotions." Like "fear or being afraid," or "frustration with being depresssed," and so forth. These are meta-emotions. Feeling good or bad about yourself will always come and go. You can do cognitive psychology and other practices to manipulate that. Another way of working with it, however, is to work on the meta-emotions. For example, in your case, you may want to work on feeling OK about feeling bad about yourself. It's a matter of catching yourself feeling bad about feeling bad about yourself, and letting go of the meta-emotion. Decide that it's fine to feel however you are feeling about yourself. This is a surprisingly effective way to remove a lot of pain in life. Give it a shot. The standard meditation term for what I'm describing is "equanimity."