Self-Esteem
Self-esteem is the way you think about yourself and what you expect of yourself. The foundation for positive self-esteem is built at an early age and is influenced by relationships between you and your family. Your feelings about yourself will change as you grow. Praise and criticism from parents, friendships at school and attitudes from teachers will continue to affect you from preschool through high school. Persistent criticism, teasing and failures can make you feel worthless. Praise, support and finding something you are good at can help you develop confidence in yourself.
Info from TeenBeauty.com