>>2192752Because Kaworu gets told he's Adam.
You can't "magically" find out stuff like this. If you were some ancient god, you wouldn't just know out of nowhere. You'd be crazy and put in a loonie-bin.
Rei doesn't have that same luck or privilege, Rei is told that she's just little poor Rei, the girl that's an artificial human being living a lie.
Rei senses there is something more in episode 25 though, so there might be a feeling.
There's also what
>>2192760points out, that Rei could be as developed as she seems to be despite being just ten years at most because she is Lilith and can excel at being a human.
