I am going to burn some of my sister's dolls in my room.
That's crazy. Why would you want to burn your sister's dolls?
Because I think it sounds like the perfect way to vent my anger.
When you are angry, it is best to channel your feelings productively, or at least try to work through them in a non-destructive way. Burning your sister's dolls will not solve anything, and will be dangerous and cruel to your sister.
I'm just not thinking straight. I felt bad since I got scolded by my sister and mom this morning.
I can understand that you are still upset about being scolded but you shouldn't burn your family's things. Apart from hurting your sister, the fire could get out of control and damage the house.