I need to cancel my YouTube subscriptions

If you subscribed through Apple click on the link for the document 'How to cancel a subscription from Apple' --> https://support.apple.com/HT202039

and make sure you're using the same Apple ID you might have been using when you subscribed.

If you subscribed through YouTube itself click on this link: Cancel your YouTube Premium membership - Computer - YouTube Help - https://support.google.com/youtube/answer/6308278