I think you should take part to the outdor activities. Not because the social worker says so, but because it is good.
When I was a teen (are you young?) I was quite secretive and lonely. I would tell to myself that I was just the solitary type, that there was no need to challenge my fears. Now I'm 36 and I'm paying the price (a HIGH one, believe me). No one can live alone.
Go! Do it! Before it's too late.

The best of luck