Coccinelle, when I was on my own I really enjoyed it - yes I thought of Christmases past, but I could choose what I wanted to do, and be peaceful, and not under any pressure. My mum and sister came round at teatime, that was very welcome, but I could do it as I wanted to. As you say there are plenty of places which would welcome your input - homes for adults and children, soup kitchens, etc. I have indeed been away over Christmas too - I went with friends to the Middle East where there was not a Christmas tree in sight, and that too was enjoyable.
I think it's important that other people don't hassle you that you mustn't be alone, some people are paranoid about keeping company with you - if you have come to enjoy your own company, you can make space for yourself too. I wish you - whatever you do - a very peaceful and happy Christmas ♥