M.G.
I have learned the hard way to let my son (big time introvert) just do his own thing. He is happiest on his own and gets very out of sorts if I intervene too much.
My husband is the exact same way. He told me to leave my son be.
I went to a few counselling sessions to help me parent better. My son was having a hard time at school, feeling very drained and coming home super negative. He's learned some techniques to help him, and I learned to back off.
My son enjoys some hobbies that are quite young - and he can't do these hobbies with friends without being made fun of. He has one pal who is also into the same hobbies (another introvert - big time), and they enjoy a nice friendship. A lot of it is online though. Neither of them feel a big need to get together.