He could be an introvert and/or have social anxiety. As an individual with both, I can attest that you must honor his social comfort zone. If he wanted to hang out with friends/peers, he would invite them. He’d make plans. Etc… Another possibility is that the planning is overwhelming for him due to executive functioning delays.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism