My existence. I'd rather not celebrate Christmas, although preferably any other holiday as well. But I especially hate Christmas. I'd rather just keep going on as usual.

My mom's a hoarder, so first thing is finding some space that will be enough for a Christmas tree in all that trash. That 2 decades old tree that will soon have no more plastic to shed really fits into that atmosphere. Then remove trash from table to put food there.
My parents will then pretend to be a moderately happy family for the next 2-3 days before returning to "normal". (They can't get a divorce "because God forbids it")
There's also the aspect of mandatory gifts. I don't know what you want, you don't know what I want. We could both save money (and generate less waste) by leaving that out. I don't want anything. It's by far worse to deal with unnecessary gifts than simply nothing.
Decorations. Why? It's everywhere. Blinking lights, glitter, chains and whatnot. Just another thing to deal with, another thing to spend money on, more waste produced.
Music. It's like 3 songs on repeat the whole Christmas. Everywhere I go.
TV shows. Suddenly it's all Christmas-themed. All showing unrealistically happy families.

There's a bunch of other reasons, but it's hard to list those. I'd just rather not be conscious during these times, just skipping it.
At least I have a dog.

I'd just rather keep going to school. I wouldn't have to be home at least. And almost all of my teachers are nice. School lunch is also generally good. Oh, and I can take train/bus rides. Those can be quite refreshing. I can be there for hours. If the school ends sooner, I can extend my commute. So far the best one I can take extends it from just 45 minutes to much nicer 6 hours. It includes 2 city bus rides, 1 intercity bus ride, 1 train ride and some time for a walk in a city further away.