if you have closed or disabled your account you can't get back on it!
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).
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.
You need to be 18.
promote your account! let your friends know about it, put it on your tumblr if you have one!
Have you got wireless Internet? Because you need that to go on the Internet.
I don't know. Maybe it's your computer worrying about a virus. I have an account on Youtube called TheyCallMeDaBomb, LOOK IT UP!! :D
most likely youtube is fixing the website. just let it wait a while and soon enough it will let you on! wait until the green bar at the top that says "youtube is undergoing...." is gone or you have put wrong information in
go to profile>my account>contact us