I have a grandson. He stays in his room all day with the door closed. Each time someone calls him, he screams at him/her. He rarely goes out. I think he suffers from autism. 

I love him and try to give him everything he needs. I would tell him: “When I was a child, I was like you. I also did not want to meet anyone and wanted to live alone. But it would be better if you followed me and go out to play with grandpa. 

Since that day, he listened to me and is less self-destructive.