I'm NOT a mother (yet) but I agree with everyone who said to wait. This is such a petty thing, why would you want to cause avoidable friction with your mom over it? It won't kill you to wait and maybe you'll change your mind.

You are still under her roof. Like it or not, you live by her rules. She's not doing it to be a b!tch - she's doing it because she has your best interest at heart... and because you're a minor, her best interests trump your wants.