have siri say my name every time

Open Siri by pressing and holding the Home button. Say "From now on, call me John Doe." Siri will confirm the new name for you. This will change the "nickname" entry on your personal contact.

Then simply say; Hey Siri! Who am I? or What is my name?

You may get better and prompt responses if you may kindly provide the iPhone Model that you have and the iOS version if it is known to you.

Settings --> Siri. Select your own contact there.