My LG G3 Beat use to have pin code lock and unlock access screen

Now when I turn it on it wants me to access through my google account why??? I also don't recall my google account or having one how do I get back into my phone??? It hasn't been used for awhile??? Plz help

If you've forgotten your Google account - not just the details of it, but its very existence - I don't see that there's anything you can do, except perhaps ask others if they know your Gmail address, then use it in Google Account Recovery and proceed from there.