Is there any specific reason other than stopping ads that you bought premium? Cuz uh, adblockers are free mate, if that was your only intention you just wasted $60 regardless. Every platform (except maybe smart TVs with proprietary OS's) have some kind of adblockers available, whether it's through a browser extension on PC or a dedicated app (like Youtube Vanced for Android) that gets rids of Youtube ads.
Secondly, from what I understand about sharing premium, your friend has to set his account up as a "Family manager", and then your account has to be setup as his "family member", however that works with Google. If you didn't do that already, or if you can't do that now because of whatever it is you did, just create another google account and follow Google's instructions.
BakerMan
Psionic Roshambo
