Non-suicidal self-injury has become widespread among young people in many developed countries of the world, and therefore is a serious medical and social problem that requires comprehensive research to develop effective measures of assistance and prevention. The aim of the study: to study the characteristics and determinants of the selfdamaging behavior of teenage girls based on the analysis of various elements of self-concept. Sample characteristics and methods. 76 girls aged 15 to 17 were examined, 37 of whom had various manifestations of self-destructive behavior (the main group), and 39 were healthy (control group). As self-destructive were considered forms that suggested self-injury or physical harm to oneself in the absence of conscious suicidal intentions. In order to highlight significant differences between the groups, a level analysis of a number of basic psychological characteristics was carried out. Statistical data processing was performed using the SPSS-21 software package. Results. It was found that in the structure of personality traits of adolescents with self-injury, the largest share is made up of factors associated with self-concept. In particular, they have more pronounced indicators of self-accusation (83.68 in the main group and 47.18 in the control), dissatisfaction with their body (7.83 and 6.08), egocentrism (24.22 and 12.05). Self-attitude (24.84 and 78.35), self-esteem (19.27 and 70.9) and self-sympathy (33.35 and 61.54) are less pronounced, while the overall level of maladaptation (1.68 and 1.08) is increased. According to the results of the study, it was concluded that the self-concept of adolescents characterized by non-suicidal self-injury is dysfunctional. It does not perform functions that promote psychological adaptation and social integration of adolescents, which can, in general, be considered as a factor of increased suicidal risk.