The peper discusses the self-esteem at primary school students, wellbeing of dealing with extracurricular activities and the children's environment and its impact on selfesteem. This work includes a research that examined the correlation between sport competences and self-esteem and children self-evaluation of their own competences in activity, and children's evaluation of their friends, parents and coach/activity leader opinions about children competences in his activity. The study used a questionnaire, a self-esteem was tested test with Coopersmith selfesteem inventory (SEI), form B, which has adapted and translated into Croatian by Katica Lacković-Grgin (1994). Research has shown that there is no statistically significant difference in self-esteem between children who are involved in extracurricular activities and children who are not involved in these activities. Also, there is no statistically significant difference in self-esteem between children who are involved in sport activities and children who are involved in other type of activities, more precisely, children who are not involved in sport activities. However, the results show a statistically significant correlation between children's self-evaluation of their own competence in activities they are involved in and children's evaluation of their friends, parents and coach/activity leader opinions about children competences in his activity.