Welcome, I am Cory.
I am sorry you are having this issue.
Is it connected to another Gmail account?
Most important - Please make sure you are signed to the account you want to delete.
If it is not connected to another Gmail account and you want to delete the whole Google account, please click https://security.google.com/settings/security/deleteaccount and follow the instructions.
If you just want to delete the Gmail account and keep the rest of the Google account, please click https://myaccount.google.com/deleteservices?pli=1 and follow the instructions to delete the Gmail account only.
If you have any questions, I would be happy to answer them.
If this helped you, please do not forget to rate my answer today.
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