I'm not sure withdrawal is the explanation as much as just not knowing how. I stood back and was watching my grandson at a birthday party one day and it took me back to my childhood and it's like I knew exactly what he was doing and feeling. He stood back from the group of kids watching with the desire to join them but didn't quite know how and it broke my heart. The kids played pin the tail on the donkey and he stood in the background, like he was waiting for someone to say it was his turn but went unnoticed by the other kids. By the time he did the pin the tail, all the other kids had run off to the swings. Then I watched him repeat the same thing at the swings.
We wait for the invitation because we don't know how to get in there and join the group, and often not noticed so we never get to join. It's sad when you see it. It's sad when you're the one waiting for an invitation to the group that never comes. Others just push their way into the group and we just can't do that.
I've often said with my daughter in law, when she says how lucky she is with me as her mother in law, remind her that she pushed her way in whether we wanted it or not and really didn't give us a choice - she was now part of the family. That's what it seemed like. Oh, she was most definitely welcomed into the family, but I say it was all her doing. That always impressed me that she was so easily able to do that - something I could never have done.