Answer: "Schizoid Personality Disorder".
Step-by-step explanation:
People with this disorder tend to have difficulty forming and maintaining social relationships and may prefer solitary activities. They often appear indifferent to the opinions and feelings of others, have limited emotional expression, and may seem detached or aloof. In severe cases, they may experience depersonalization or derealization, which can make them feel as though they are disconnected from reality or living in their own isolated world.