Self-esteem refers to one's feelings of high or low self-worth. It is the global
            
             evaluative dimension of the self. For example, adolescents feel good about themselves.
            
             Self-concept is all out thoughts and feelings about ourselves. It is the specific evaluations
            
             of the self, such as academic, social, physical appearance, behavioral conduct, and so on.
            
             In many years, the psychologists measured the self-esteem and self-concept
            
             primarily for the children and adult instead of adolescents. Moreover, they are very
            
             difficult to measure since there are many domains and conditions to be considered,
            
             especially in approaching adolescents. As a result, Susan Harter developed a separate
            
             measure for adolescents-the Self-Perception Profile for Adolescents. It includes eight
            
             domains, such as scholastic competence, athletic competence, social acceptance, physical
            
             appearance, behavioral conduct, close friendship, romantic appeal, job competence and
            
             global self-worth. Since then, the psychologists began to concern about the self-esteem
            
             and self-concept of adolescents.
            
             According to Carl Roger, "When the ideal and the actual self are nearly alike, the
            
             self-concept is positive." If our self-concept is positive, we tend to act and perceive the
            
             world positive. We feel satisfied and happy about the world and ourselves. On the other
            
             hand, if our self-concept is negative, the ideal and actual self are very different, we will
            
             feel unhappy, unsatisfied and hopeless. Furthermore, if we have high self-esteem, we
            
             have fewer sleepless nights, cope better with the pressure and stress, are less shy and
            
             lonely, feel happier. On contrast, if we have low self-esteem, we are vulnerable to feel
            
             unhappy and despair because we usually think that we are falling short of what we ought
            
             to be. Moreover, we would also commit suicide, anorexia nervosa, delinquency, and
            
             other adjus...