Try to eliminate any negative thoughts about yourself and your work. Do your best, but don’t expect perfection. Expect your best efforts from yourself, but don’t beat yourself up over honest mistakes. Keep reaching for self improvement, but don’t hamper yourself with thoughts of “I’m so crappy at my job!” If you really think you’re crappy at your job, you have two choices – improve or leave. If you’re actively trying to improve, you’re doing a better job than a lot of people.