Perhaps because your father questioned you for so long, you question yourself.. just out of habit. Despite the fact there's plenty of evidence to show that you are usually on the right track, a vague nagging feeling persists. You may not measure up to your father's ideals.
Compare these expectations to those who love you; They don't ignore your inadequacies. Instead, they are willing to pitch in. They cheer for you. They don't run away when you fail. Their arms remain outstretched in acceptance.