Is There A Way I Can Change My Email If I Do Not Know It?

Go to this page, and select "I forgot my username." (Your username is the portion of the email address preceding @gmail.com.)

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When you sign up for any email they ask you for an alternate email just incase yu ever forget your username or password. To find your user name if you have forgotten it, click on forgot username. They will ask you toput in your alternate email address and soetimes a security question. After you complete this step, check your alternate email for your username. Write it down and keep it somewhere safe so you will not forget it.