@drillersmum,
If you are happy with it then so be it. Although I think it is kind hearted of those people you know that are concerned about you spending it alone. Just re-assure them - no really I love to spend the day with my wonderful mutts.
I have a good size family and holidays are a big deal. When I was a young adult and living with just a roommate, my mom had to fly out on Thanksgiving for a funeral. As a result, we as a family decided to "postpone" our family Thanksgiving for the weekend.
My roommate felt bad for me being alone on Thanksgiving as she went out of state to visit her family. I loved it - I bought a small turkey breast and just cooked up my own meal and worked on a project for grad school. I completely enjoyed having the day to myself. And her two cats.
It should be as you find pleasant.