I don't know my primary account holder email

I can help @user_lcg7a3 

To locate your username for your Xfinity account please start with this link http://xfinity.com/getstarted 

You can use this link to reset your password http://www.xfinity.com/password 

What email is my primary account under 

Find that out with the UserID Lookup Tool at https://idm.xfinity.com/myaccount/lookup. After you enter the requested information the page will tell you the userids on your account and indicate which one is Primary.