Self-defeating behaviors are often caused by conscious self-analysis, self-criticism, and introspection if done as a form of continual second-guessing. Attempting too much sets up inevitable failure, which we later berate ourselves for not having accomplished. Feeling jittery, worried, or anxious thinking about the great amount of work before us is a classic form of negative feedback. We believe we should be able to do everything all at once. We practice self-condemnation by holding ourselves to unrealistic expectations.