See if you just remain scared like this then I would assume you'd never have your ears pierced! So why not give it a try maybe just a try can change your life so just give it a try maybe they will allow you after you have convinced them very nicely! For some lines to convince them you can say like "I really like this and by doing this I don't change into a girl, this my passion and I am really fond of it, I'm sure you'll allow me as you both really care about me, so please can I pierce my ears, please" So you can say something like that!