HELP ME PERSONALIZE MY ROOM IM A 14 YR OLD GIRL! PLEASE?

I really wanna make my room more me i love justin bieber i love love love love love love singing sooo much more then anyone could ever imagine i feel that atm my room is just not me i dont know what to do to change it i basically wanna redecorate my room is there anythings i can make myself to put in my room or something anything would be great thanks x