I'm fairly certain if something was 100% original, humanity would be afraid of it and probably want to destroy it.
We like things that are familiar. If we can relate to it, we feel at ease. We like adventures but within the scope of the human condition. Anything too far gone might feel distant like a psychedelic experience, and potentially scary.
But yeah, everyone's got their own flavor of experiences to make the old stories we like interesting again. Don't beat yourself up over what's original or not. Humans just like taking innovation in baby steps. Its just how we roll.