Youtube premium cancellation

So, i wanna cancel my YouTube premium and when I do it through youtube it takes me to apple subscriptions because it's billed by apple. And the thing is there's nothing there because it's my other apple account. BECAUSE I ONLY HAVE ONE. THERE IS NO APPLE ACCOUNT WITH THE EMAIL OF MY YOUTUBE ACCOUNT. And now I can't cancel it from anywhere. PLUS, the youtube premium started by itself. I was in class and suddenly I got an email "Congratulations for your free trial of youtube premium". This is dirty from apple. How do I cancel it.