I do this. It's a product of shame, self-condemnation and lack of compassion toward myself.....it's seeing the negative aspect as more real than the positive and not be able to accept that it's OK to experience emotions, thoughts, feelings, that aren't so positive sometimes. So, yes, I understand.....I'm working on learning to accept ALL aspects of myself and see myself in a more balanced way.....and not see myself as ALL bad just because I have say, an angry moment, or something.