I don’t think Kylo/Ben is particularly afraid of who he is though, is what I’m saying. Unsure of it? Certainly. But these are two very different concepts. And it’s clearly the same recording of her saying it to Rey, which is kinda immersion breaking in this impactful moment. That phrase is integral to Rey’s arc, while Kylo’s is moreso about understanding that he is under no obligation to choose the dark side. And that there’s ultimately more power in the light.

The only thing Kylo is ever afraid of is that he isn’t as as strong as Darth Vader. But that’s largely dropped by TLJ and would only be relevant in this movie if you were to insert the Vader/Kylo duel vision I’ve been working on in my thread.