I signed up to YouTube only to comment on a friend's video. How can I quit google?
To quit Google, you need to sign in first. Click your full name or email address in the Google+ bar and then go to the Account settings. Click the Account overview tab and click the Delete Profile and remove associated social features.
I think you can type in google and ask how you can delete your account and it will more than likely give you the info
You can't. Google bought YouTube so now they're conjoined.