How do I convince her?

How do I convicte my mum to let me hang with my friends, my cusin started getting permission to go out with his friends at the age of 15 and he would something go out with telling is mum and sometimes stay out for weeks without even calling and stuff

But I've just turned 17 and my mum still won't let me at least go by my friend to play some games and she wouldn't even let my friend come visit
How do I convince her?
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