Parents wont let me have a regular bed!?

i have a bunk bed and its metal and theres no mattress on the top so i put random stuff up there. I am 13 and i want a regular like every other teen and im the only child. i'm dying for a bed like this picture included. http://www.tchochkes.com/wordpress/wp-content/uploads/2009/02/pb-teen-headboard.jpg