Self-esteem is a term in psychology to reflect a person's overall evaluation or appraisal of his or her own worth. Self-esteem encompasses beliefs (for example, "I am competent", "I am worthy") and emotions such as triumph, despair, pride and shame[1]. 'The self-concept is what we think about the self; self-esteem, the positive or negative evaluation of the self, is how we feel about it'.[2] A person’s self-concept consists of the beliefs one has about oneself, one’s self-perception, or, as Hamlyn (1983: 241) expresses it, "the picture of oneself". Baumeister (1997) described self-concept as total perception which people hold about him/ herself (p. 681). It is not the "facts" about one-self but rather what one believes to be true about one-self (Sarah Mercer, p. 14). Early researchers used self-concept as a descriptive construct, such as ‘I am an athlete’ (Rosenberg 1979).
Recent theories adapted self-esteem with more evaluative statements like ‘I am good at tennis’ (Harter 1996). The latter statement not only describes the self, as the individual identifies herself or himself, but evaluates the self by putting worthiness on it. Therefore, self-esteem is defined as both descriptive and evaluative self-related statements. As a social psychological construct, self-esteem is attractive because researchers have conceptualized it as an influential predictor of relevant outcomes, such as academic achievement (Marsh 1990) or exercise behavior (Hagger et al. 1998). In addition, self-esteem has also been treated as an important outcome due to its close relation with psychological well-being (Marsh 1989). Self-concept (i.e. self-esteem) is widely believed to be composed of more than just perceived competence, and this leads to the relative degree of