Me too. My childhood Christmases were filled with tension and arguments, fuelled by my father's drinking and my mother's resentment at having to make everything happen with no help from him. I think that set me up to be quite negative about it all, although I try to keep those thoughts to myself as I don't want to spoil it for others.
Also, from November I have SAD and feel like hibernating.
I'd like to go abroad and stay there in the sun for the whole winter, but that isn't an option. So, I go out for a long walk every day to get some daylight and fresh air, and I use a special SAD lamp when I get up. I take Vitamin D through the winter to compensate for the lack of sunshine.
We keep Christmas decorations minimal - just a small tree with a few fairy lights dotted around. We keep the card list minimal too - no cards to distant relatives we hardly know and never see, no cards to people we don't socialise with - if we don't like them enough to socialise with them throughout the year, there's no point in maintaining contact by Christmas card once a year. Also, no cards to neighbours - it's silly when you can just wish them happy Christmas in person, when/if you see them. But we send cards to close friends and buy special cards for certain older relatives who really love receiving them.
This year DH and I will be on our own, and we plan to just eat, drink and slob out in front of the TV, after a long walk. I'm looking forward to the Gavin & Stacey special, and will probably watch Love Actually (for about the 20th time!) and other feel good movies. We won't have a Walton Family style Christmas, because neither of us have that type of family, but it could be worse. I always feel better in January, when the days start to lengthen and I look forward to spring.