The article examines the question about correlation between general anxiety of an adolescent and effectiveness of his behavior in unstructured group discussion. Anxiety as a personality trait significantly influences adolescent's behavior in different situations (competitions, interpersonal conflicts, decision making, etc.) including joint activity where group result is of the most significance. The results of the study prove that schoolchildren with the high level of anxiety are successful in group discussion but leader's position is occupied by adolescents with low level of anxiety in comparison with other members of the group.