LogFAQs > #979416536

Isn't the protagonist a kid? I don't really remember.

But perhaps you should view it less as "protagonist is a thoughtful person with agency who has a goal" and more like "kid ends up in weird world, just starts exploring and meeting people and going along with whatever they're told" (as i recall, toriel and other NPCs start guiding you around and telling you what to do pretty quickly)