That's strange - I only see two users in my Discord and neither of them have your name. Here's what some online research told me:

You can resolve the "Email is Already Registered" error on Discord by logging into the existing account tied to that email or using the password reset feature on the Discord Login Page.

How to Fix the Error

• Log in instead of signing up: If you already have an account using this address, go to the login screen rather than the register screen.
• Reset your password: Type your email on the login page, click Forgot your password, and check your inbox for a reset link to regain access to that account. 
• Contact support: If you believe your email is being used without your authorization or you are stuck in a claim loop, submit a ticket directly through the Discord Support Request page