How can you shrink your penis?

Hi everyone, im 13 year old Buk Lau.I have an extremely large penis that refrains me from participating in school activities.I have a hard time doing the beep test..because my penis is nearly 12pounds.I usually last until level .5 which is the lowest in history at my school.Anyways my penis is 27" in size....yeah i know disgusting.I cant have sex cuz i know girls wont be able to handle that..might even kill them.I cant even wear shorts since i turned 10 because it was visible. PLEASE HELP SHRINK MY DICK :(