moi aussi -He wishes he could live on an island by himself where nobody would bother him, nobody would talk to him, nobody would offer him anything nor request anything from him.
I wonder if he will ever marry…
It seems he goes to minyan so that’s a start. It is not that hard to find an abandoned island. Give him a cell phone some food and a tent and leave him on the island for two weeks and see if he survives. Try to give him some independence such as letting him buy and cook his own food. I think part of the problem is that for most of his life people have dictated to him what he can do. He is rebelling and withdrawing inside. He may or may not also be depressed. His father needs to find a yeshiva that caters to this boy’s needs and make him happy. Once he is happy he will socialize. Once he socializes he will marry. You need to take it step by step.