Social groups for teenagers

Hi,

I’m at a bit of a loss how to help my teenage sons to get out and meet other like minded friends. Both have not attended school for a long time and have lost touch with friends. Whilst they like their own company and are afraid of being out in the big wide world, they are lonely and bored. Everything I suggest is a no, and they’re anxious and isolated. 
We live in Derbyshire. Does anyone know of any social groups nearby or have any suggestions.

Many thanks, Emma