I want a larger room instead of it going to my brother.
Why do you want the larger room?
My brother doesn't deserve the larger room.
While it's best to try to split resources as evenly as possible within a family, sometimes it's not possible and people can receive a larger share than others. Try to see the positives in your own room, and understand that not everyone even has their own room. Maybe even switching things around would make the room feel more fresh to you.
Fuck that. My brother don't deserve this consideration.
That may be the case, however what would make you a good person would be being able to see the positives of you having your own room.