My school email address is not @gmail.com, however, it is managed by GMail, so I log into a special school log-in and it takes me to my email with the familiar GMail tools and GMail inbox. Unfortunately, it linked itself to a youtube account. I want to either delete this YouTube account or unlink it.However, as you can see, there is no unlink button nor are there delete account options. I also tried this question : How do I unlink my YouTube account from my Gmail account? and followed the link to Unlink Youtube and Google Accounts, but it doesn't do anything and simply redirects me back to my Manage Account page. 
How Can I Delete My YouTube Account?
youtube;account management