Holidays are tough for me as well. I only go out to family because I don't want to disappoint my daughter who is a teenager. Christmas is a big deal for her. I would be perfectly content to sit at home in my Pj's with a carton of Turtles icecream and a pile of movies or a good book to read. This would of course have to include no phone calls, and no one ringing my door bell.
I have problems with agoriaphobia in a mild sense. I go to school, go home, pay bills, and grocery shop when I have to. I do not stray out of my safety zone often, this causes extreme anxiety, and it is very wearing on the nerves.
You are definetly not alone.