My mac went black and now its asking for a guest password?

hello, I was trying to save all my information in my mac laptop and asked for a password I did type my admin password then laptop froze and went black! now its asking me for a guest password, I dont remember to have one! I tried all the passwords that I have/had and I doesnt take them! I cant pass from the start screen
If someone can help me!
thank you

That's not a password, it's your Apple ID. The same one you use to log onto this site or the App Store.

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