what do i do if i have secretly started shaving my legs and i havent told my mum

What I do is I secretly get my mums razor and I shave my legs secretly and then I return it without her knowing

I finally want to tell what do I do because you can tell I have already started shaving because my leg hair is darker and prickly and thicker

I asked her if I could start shaving before but she said I have no hair there and I'm too young

Should I not shave for a while and then tell her and show her how hairy my legs are or not ??

PLEASE HELP