title: Confused by SQL Server Express when create a new database
body: <p>I am an administrator of of my own machine, I have SQL Server Express installed. But when I tried to create a new database I got this error</p>
  
  <blockquote>
    <p>Create Database permission denied in database  'master' </p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/jIWN0.png" alt="enter image description here"></p>
  
  <p>I figured I was missing 'sysadmin' role for my login. When I tried to add my self as 'sysadmin' I got another error</p>
  
  <blockquote>
    <p>User does not have permission to perform this action</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/4fVbZ.png" alt="enter image description here"></p>
  
  <p>I am the administrator of this machine, why cannot I have permission to create a new database in this SQL Server Express instance?</p>
  
  <p>Thanks</p>