My daughter, not diagnosed with ADHD but with anxiety, has been much the same all through high school (she graduates next week). She tells me she has a hard time reading people and is scared to death of accidentally saying something insensitive, offensive, etc., so she just doesn’t try. She has a few friends but rarely sees them outside of school (they invite her to parties, but she hates parties).
I used to push her to try to do things outside of school with friends. It just stressed her out. Eventually, I accepted that she’s an introvert, has a lot of social anxiety (as do I), and is genuinely more comfortable being at home or with another person one-on-one.
Here’s more on social anxiety:
And on helping teens with social skills:
By the way, my son (14), who is diagnosed with ADHD, spends a lot of time on the computer, and has finally made some real friends because of that shared interest.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism