The process of puberty opens up significant changes in the construction of identity, on the background of the changes of the narcissistic-object during adolescence. Sexual violence in adolescence can be considered as a marker of a failure of puberty rearrangements, in the context of the traumatic re-actualization of an injured narcissism. Following the presentation of theoretical perspectives on identity in its relation to narcissism, the presentation of the psychoanalytic treatment of teenagers allows for a clarification of the stakes at play in a suffering identity.