Welcome to the forums. That's very unfortunate. I think your only option is performing a factory reset and then enter your Google credentials. Do you still remember you Google account and password, right?
I'd like to recommend creating a account so me or other members can assist you, as guest have limitations in replying here and if we need further Information to communicate with you.
I'll provide a link to register, please come back to your post so we can further assist you . Thank you