There is no nobility in being better than someone else. The only nobility is being better than who you were the day before. Self-esteem results from school achievement. You cannot give someone a better self-esteem. The role of a teacher is to engineer student success.
Teachers can only give what and who they are themselves.
You may be the only stable adult your students will ever see in their lifetime. You may be their only hope and dream for a brighter tomorrow. Each person has unlimited potential. Humans are the only species able to improve the quality of their lives. You can have your achievements or you can have your excuses.