If you feel like a failure at times, you're in good company. The apostle Peter himself repeatedly had a fair amount of trouble getting it right. He denied the Lord three times, and was even warned in advance he was going to do it, and he *still* couldn't manage to stop himself! Peter had numerous "fails" and he was still the rock on which the church was built. He was afraid. He was weak. His faith faltered. But he kept going. You keep going too.