Problems with the Twitch registration?

I have problems registering with Twitch and I know the username and password, but then I'm asked for a verification code, which is sent by email, but I no longer have this email address.

And I can't create a new account because I'm told to use a different email address?

How can I delete my old acc and create a new one?

You can just quickly create a new email. Just go to google, add an account, and it'll be easy