If you live or work with someone who has narcissistic personality disorder (NPD), you probably often feel put down. You feel ashamed of your own needs. Your relationship may feel so out of control that you wonder if you've lost your sanity. Narcissistic Personality Disorder, often mistaken for a too-big ego or inflated self-esteem, is in actuality a severe psychological condition that ruins marriages, social relationships, work environments, and the sufferer's own sense of self. Although perceived as self-confident and arrogant, narcissists are really victims of devastatingly low self-esteem and insecurity.