Just a little, slightly off-topic, unsolicited opinion of mine here:
Christmas has nothing to do with how you feel, it's about how you make others feel and your obligation to them. That's the point. If you feel good during the holidays- if you feel happy when you give to others- that shows you you're human and that you recognize the goodness of the holidays. Your feeling good when giving is an educated response, not an intrinsic one...But regardless, the holiday is not for you, it's for them. One for all, and hopefully, all for one.
If people miss you, you must be there with them. If no one misses you, is there no one you miss that you'd like to reach out to? If you have no one that misses you, and you don't miss anyone, do you feel good about your situation?
Christmas is the day we're supposed to acknowledge, with certainty and not faith, that there is credence and merit to the notion that it is wise to live serving others. Christmas is the birth of this idea, but it's supposed to carry on throughout the year, otherwise the holidays didn't happen.
If you live in the Northern Hemisphere, imagine how much colder winter would be without the holidays. What makes the holidays warm? The people who do things for one another. It's the absurdity of making the best out of a bad situation, with happy cheer, to the point that we transform frozen water into something we play with by building snowmen out of it, and gliding on top of it for sport. This is Christmas: the birth of that happy, indomitable(snowman) spirit.