No, Gmail is not a YouTube account. Gmail is an email service that provides users with the ability to send and receive emails, as well as store their emails.
You can’t. Gmail is a Google product and YouTube is owned by Google’s biggest competitor, Microsoft.
YouTube does not have an email address.
Yes, you can email from YouTube. By clicking the “Email” button in the top right corner of the screen, you will be directed to a new window where you can enter an email address and message.