A personality disorder is a type of mental disorder in which you have a rigid and unhealthy pattern of thinking, functioning and behaving. A person with a personality disorder has trouble perceiving and relating to situations and people. People with personality disorders usually have a hard time getting along with others and dealing with everyday problems in the ways that are expected by a cultural group. They commonly believe that their way of thinking and behaving is completely normal. However, they tend to have a view of the world that is quite different than others. As a result, they may find it difficult to participate in social, educational, and family activities. They also place blame on others for their challenges. These behaviors and attitudes often cause problems and limitations in relationships, social encounters, and work or school settings. They may also make people with personality disorders feel isolated, which can contribute to depression and anxiety