Just leave.

Why do you want to delete it? Just leave, don't use your account anymore, and don't ever come back.

(Not telling you to leave, I would love for you to stay, but there's really no reason to 'officialy' delete your account)

Change your email to something fake, randomly bang on the keyboard to create a password you don't know, and logout.

That's not a solution, that's a hacky workaround.