Im 13 , girl and i want a tongue piercing. how do i convince my parents .. help!!?

im 13 and i want a tongue piercing.. yeah ik that they will prob say no but i reallllly want it more then anything in the wold! now how to i convince my parents to get one... any ideas.. ?? i always said to them.. it my body my choice .. but legally till im 18 its theres.. which is fu*ked.. :( plz help