Check your credit reports. Pulling your credit report and credit score is the most accurate and convenient way to find all of the accounts that have been reported in your name. Your credit report will display every open account in your name, from bank accounts to credit cards and more.

Go to the sign in page of the product (for Google Accounts it is myaccount.google.com). Enter your Gmail username (everything that appears before '@gmail.com').

To change your Gmail address you'll have to create a new account. But there are a few exceptions. For example, you can add or remove some dots in your Gmail address. Or change the name associated with your email address.