How do I delete one profile if they are both admins?

As mentioned it's not a problem having more than one Admin account. However, it's easy enough to remove a second Admin account. Go to System Preferences > Users & Groups. click on the padlock on the bottom left to unlock it after entering your password. Then select the user account and click on the "minus" sign. Don't save the users home folder.

Do you mean you created a second Admin account in Users&Groups?

That is simply not a problem in the slightest. Just ignore the one you don't want to use daily.

MacOS is inherently a multi-User system. Whether you create one User account or many, it operates the same way. Every user is protected from every other User. Having additional Users does not present any additional risks to anything.