The Most High God wasn't talking to himself in Genesis when Adam [mankind] was created, he was talking to his family (aka the Divine Council).

Is there scripture to back this up?

You bet there is.

“Where were you when I laid the foundation of the earth?

Tell me, if you have understanding.

Who determined its measurements—surely you know!

Or who stretched the line upon it?

On what were its bases sunk,

or who laid its cornerstone,

when the morning stars sang together

and all the sons of God [Bene Elohim] shouted for joy?

- Job 38:4-7

Are you saying that before the world was created (which included Adam), there were other beings?

Yes, yes there was.