Sure, I felt it! And it has a name, actually: 'The Imposter Syndrome'.

Sometimes, our self-doubts are very strong and we tent to think "I had no idea what I'm doing, and they're going to realize it!". That's The Imposter Syndrome.

I know I'm not a fraud at all, but just have some insecurities that make feel this way. As you said, I've heard it's very normal between founders.

I'd say that pitching to investors is one that moments that make me feel more 'fraudy'.