Hi Deb,
I know how you feel. I lost my mum in October 2017 and my dad in October 1985, so the anniversaries are close together and so this is a hard time of year for me too and it doesn't help if you are on your own. Lost and lonely? Yes, and no doubt miserable too. Christmas does tend to feel like a celebration going on around you that you are left out of now, I know. Still, try to make the best of it. Last year, I got a tree and decorated it and found it useful to sit with just the tree lights on in the evenings and use that as a quiet time to remember my mum and dad and all the great times we had together.
Also, there are lots of things going on on Boxing Day at least, so it might be good to get out then and do something fun. I plan to go to a dance with one of my new friends. It's only an hour long, but it's something to look forward to at least. Perhaps you could plan a trip out with a friend or with someone else who will be on their own otherwise.
If your parents are buried at a cemery, I also found it really nice to go and visit the grave on Christmas day. I know that sounds odd, but really, it seems everyone does it on Christmas Day. I have never seen the cemetary so busy or full of lovely flowers! It's like an explosion of love and inclusion and remembrance that you can actually see and take comfort and jou from!
Try putting some flowers around the house too. I find that cheers me up. If you need a chat, we're all here and happy to talk. You could always try the daily live chat on this site too. It happens each evening and can take you out of yourself a bit.
Sending hugs...