You'll need to recover the account with these steps: https://yt.be/help/o753 . To recover an account, you'll need to have at least one of the account related info(i.e email/username & any recovery options). Hope this helps.
Replying to @fur20blazeit
Hmm, it's possible that the username that you're entering is incorrect. If you aren't sure, you can try recovering your username. Here's how: https://yt.be/help/2wRB . Let us know how it goes.
2:42 PM - 7 Jun 2019
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