This was me in high school. High school was just meh, and there wasn't much to do besides drink, smoke pot, drive around, and I just wasn't into it. I did occasional extracurriculars at school, but didn't have a super active social life. I had a great time in college and felt like I really connected with people at a deeper level and had much more lasting friendships in college.

If he doesn't seem unhappy, don't worry. Sounds well-adjusted and ready to move on to the next phase of his life!

You are describing me in HS. I was friendly with everyone but was fine doing my own thing after school. Funny thing is, I ended up living in the same dorm who used to go to HS with me. Now she was super popular, lots of friends. In college, she was no longer a social butterfly. She turned in a hermit, quite frankly. She said it was liberating to no longer have to chase "popularity."

This is my 10th grade DS. I love that I am his best friend but I worry so much. He finally said, mom, would it make you happier if I were hanging out with the kids who are getting in trouble all the time? That Mae me take a big step back and realize I need to let him be him.