Question about decisions made in the dark prince

So I just got to the first meeting with the zenith dragon where he tells you about the ancient evil that has awakened. And I’m confused. I wanted to take down the evil ones but I didn’t want to become human and loose my monster blood. I think the concept of having a monster protagonist who is part monster is an amazing twist. Does this game have a different story depending on what answers you give? Because after that the theif/merchant ended up leaving the group. I didn’t want that as a result. Is there a way to go back on your decisions? Any insight or thoughts would be appreciated. By saying no the intent wasn’t to wage war on humanity. But it spiraled out of control so quickly idk what to do now.