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Try to find out what he does when he 'isolates himself' and build on his current interests, don't try to force him to go to clubs which he doesn't want to go to. This can cause more stress for him and even more withdrawal.
At least life is calm ( lucky you).
You will have to be tactful and try to get him involved with something, without him realising what is being done.
More radical suggestions, for an 18 year old
Invite young female visitors found. (Be tactful)
Or see if he is interested in pets (cats or dogs).
Try to find out what he does when he 'isolates himself' and build on his current interests, don't try to force him to go to clubs which he doesn't want to go to. This can cause more stress for him and even more withdrawal.
At least life is calm ( lucky you).
You will have to be tactful and try to get him involved with something, without him realising what is being done.
More radical suggestions, for an 18 year old
Invite young female visitors found. (Be tactful)
Or see if he is interested in pets (cats or dogs).