"I do what I want" Is something said by someone who does what they want, that person is probably superior to the people around them.
Q: when are you going to clean your room
A: I do what I want
A word usually heard from 6 year olds playing gorilla tag.
An idiot: Do you want to play mini games?
A gorilla tag player who has a brain:SHUT UP NOBODY WANTS TO PLAY MINI GAMES.