You need that hunger no matter what, because eventually the honeymoon period wears off. Somewhere between printing your business cards that say 'founder' on them and everything else you have to do, you realize, 'Oh, actually this is a ton of work. '
Surprisingly, it's forgiveness, not guilt, that increases accountability. Researchers have found that taking a self-compassionate point of view on a personal failure makes people more likely to take personal responsibility for the failure than when they take a self-critical point of view. They also are more willing to receive feedback and advice from others, and more likely to learn from the experience.