wordpress cant find my email

i have a site (URL hosted on wordpress) that i access directly with an admin login. i want to create a new site (i already have a url) on WP so i went to the main WP site and tried to log in. it said that there is no user with that email address. i have used the same email address for 15 years so that’s the only one associated with WP. i cant get into whatever account i have here because WP doesnt recognize my email addy. i am reluctant to try and create a new account least it somehow confuse my existing account. where do i go to get help with this admin stuff on WP?