How can i convince my parents to let me get a nose peircings?

i'm 15 years old and desperately want to get my nose pierced. i need my parents permissinon because iwant it done proffesionally so it does not get infected. i don't understand why they won't let me get one i believe they are very cute and if i don't want it later in life i can just take it out and it will just look like a blackhead. i need an arguement so that i can convince my parents to let me get it done. any help i thank u for. oh and please no "your to young to make decisions like that" thanks