Pray for yourself. Pray for your students. As a teacher your purpose is to help others learn. Evaluating your students shows whether or not they are learning. After every lesson ask yourself what you did well.
Some teachers are more critical of themselves than any other detractor.
They never see their positive influence or successes. They are crippled by their own unfounded sense of failure. Build on that and do more of it. After every lesson ask yourself what you did poorly. We cannot correct mistakes or reinforce weaknesses if we don't recognize them or admit them.