Are you worried?
I have a 13yo DS who seems fine, he's chatty and cheeky and does fine at school, where he seems to have friends...but he very rarely will see anyone outside of school. He does belongs to a football club though.
I had a bit of a rubbish/abusive home life when I was young, but I learned so much from friends and their families (there were some bad eggs, but some great ones too). I think my DS has a calmer and more relaxed home life, but quite often worry about lack of time outside home and school.