I don't want to go to my grandma's house for christmas this year
What is your reason for that?
Ever since she died, I've had a bad feeling everytime we go to her house.
You should try to find out what causes those bad feelings. You can't live life without knowing about it.
You don't understand what it is like being a kid. It is annoying when you tell me to do stuff like this.
If it gives you anxiety, you aren't required to go to your grandma's. You can celebrate how you want.