At first you need to show your parents you are mature. Like Be nice your Bro/Sis.
Then tell your parents that you don't want to post videos till you are older. If they ask "Why do you want a YouTube account then?" Just say "To post comments." If they say "I would rather you not look at the comments." Then I can't help you there. My mom and dad wouldn't let me have an account till I was sixteen. At first they said "Then you can have access to a lot of videos." The answer to that is "I can view all of the videos anyway." (They then know that is true) Then you ask them.
You need to contact YouTube, and let them know you want to suspend your account!
You need to have a YouTube account linked to your Google+ account to comment and let others reply to that comment, so yes you need to have an account (be a member).
if you have closed or disabled your account you can't get back on it!
well you aren't allowed a YouTube account. you have to be 13 but most people lie about their age
Yes.
get a new email adress
You can create a Gmail account (http://www.mail.google.com) and use that login information to sign into YouTube.
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You need to be 18.
promote your account! let your friends know about it, put it on your tumblr if you have one!
by just asking them 'Can I have an account on Pixie Hollow?' maybe.
SHE DOES NOT HAVE A YOUTUBE ACCOUNT!