I really wouldn't worry too much about being behind socially. I enjoy an occasional afternoon or evening out with my wife but other that I prefer the peace and quiet of my home. At work I am surrounded by people and constant chatter I am always happy to leave that behind for the workday.
I really don't care about being social at all. Basically I limit my social activities to with my wife and occasionally family, my daughter and grandchildren. You may feel that you are behind the social curve but I am telling you that you're not really missing much. Books and laptop work for me too. I guess that it doesn't take much to amuse me or find contentment
If I felt normal I would consider seeing a doctor 'cause there probably is something wrong with me. For me, each day it's the 'new normal'. I enjoyed your post very much and appreciate that you shared a snippet of your story on my thread.