Managing personal Outlook.com account settings, security, and privacy
@Jeffrey Smith said
When I go to login to Outlook in my Microsoft Edge, I went to login with my Gmail account
Outlook Web (in a browser) and New Outlook for Windows App (runs as a program) are two totally different beasts. Even though Microsoft calls them both "Outlook".
Outlook Web can only be used with a single Microsoft (outlook.com) email account. New Outlook can have multiple email accounts of any type.
Why did Outlook create an outlook email for me using my Gmail?
Outlook Web can't access your GMail account, so it offered to make you an outlook.com account that you could use instead.
How do I get rid of my weird outlook email?
Without knowing it, you have created a Microsoft Account (with an outlook.com email address) but an "Account Identifier" (what you enter when it ask you for your Microsoft Account email) that is a GMail address. Doesn't make any sense does it? I don't know why Microsoft allows this, it just confuses everybody.
To get rid of it you first have to logon to it:
Open https://account.live.com/names/manage
Use your GMail email and whatever password/verification you setup when it created the outlook.com account for you.
It should show something like this, with your GMail email as the "Primary"
Now that you have confirmed this is the Microsoft Account with a GMail Name, you can delete it by following these instructions.
https://support.microsoft.com/en-us/accounts-billing/manage/how-to-close-your-microsoft-account
Can I login to my Gmail within Outlook or do I have to just use the official Google Gmail website?
You can add your GMail account to the New Outlook for Windows App using these instructions. (You can not access your GMail account from Outlook in a browser)
https://support.microsoft.com/en-us/outlook/getstarted/add-a-gmail-account-to-outlook-for-windows