Your objective is to take responsibility. If there is a person who is emotionally bound to follow through on all promises - then it's you. Your strong ethical principles do not let you to simply write missteps off on excuses and rationalizations. It holds true no matter how small or large is the issue you are dealing with. Your name and reputation depend on you being responsible for your commitments. That's why people love to have you in their team. When assigning new responsibilities, they look at you first. They are 100% sure that what'll get on your desk - will get done no matter what.