My family is dysfunctional, too. Last year I did spend it alone and I loved it! Checked into a hotel, watched Christmas movies, ate too much, and thoroughly enjoyed myself. Always helpful to remember, too, that Christmas is about Christ and what He did for us. Spending Christmas alone last year was a blessing for me. Set your mindset positively and make it a good holiday.
If I were going to design Christmas, it would involve lots of movies, some good wine and going to the kid’s service at church.