Narcissistic personality disorder is a condition characterized by an inflated sense of self-importance, need for admiration, extreme self-involvement. Individuals with this disorder are usually arrogantly self-assured and confident. They expect to be noticed as superior. Many highly successful individuals might be considered narcissistic.
Narcissistic traits are very common in adolescents, but most adolescents grow out of this behavior. Unfortunately, for some, this narcissistic behavior persists and intensifies into adulthood.