This patient most likely has schizotypal personality disorder. These patients have problems with social and interpersonal relationships, which are marked by significant anxiety and discomfort, and they also exhibit odd thinking, speech, and perceptions. This disorder is classified as being in the cluster A personality disorder group. Patients with disorders in this group exhibit odd or eccentric personalities, and the group includes paranoid, schizoid, and schizotypal personality disorders.
Cluster B disorders are characterized by dramatic, emotional, or erratic personalities, and include antisocial, borderline, histrionic, and narcissistic personality disorders. Cluster C disorders include avoidant, obsessive-compulsive, and dependent personality disorders. Patients with disorders in this group exhibit mainly anxious or fearful behaviors.
Ref: Angstman KB, Rasmussen NH: Personality disorders: Review and clinical application in daily practice. Am Fam Physician
2011;84(11):1253-1260.