how can I remove G mail from my computer FOREVER!!

See here:

Use your internet accounts on Mac - Apple Support

BergenCounty Said:

"how can I remove G mail from my computer FOREVER!!: How can I remove my Google or G mail accounts?"

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Remove this Mac:

Try this Link: Remove apps with access to your account - Google Help. You would log in to your Apple Account, and proceed from there as necessary.

BergenCounty wrote:

These two apps send far too many unwanted accounts that clutter my devices, mostly iPhones, but also computers

What apps? You asked about your Gmail account. Please explain exactly what it is you're trying to delete.

See the link https://support.google.com/mail/answer/32046?hl=en