When a person exhibits a personality style that differs markedly from the expectations of culture, begins in adolescence or early adulthood, is pervasive and inflexible, and causes distress or impairment

Personality Disorder is the correct answer.

People with personality disorder exhibits a personality that is considered odd or eccentric. Research has shown that those who suffer from personality disorders do not experience emotions the same way as the majority of people do. Even though it's not common to be diagnosed with a personality disorder before the age of 18 (since, at this age, one's personality is still developing), studies suggest that personality disorders begins in adolescence or early adulthood causing distress or impairment.