A business owner who wallows in self-pity will fail. Emotions are human, but letting them stop you from acting kills the venture. Control your feelings instead of letting them control you, and focus on delivering value.
You're sad, you're tired, nobody cares. The world only cares about results. What are you going to do for them? How are you going to provide value? Now, I'm not saying that there's not a time or a place to be sad. Feeling emotion is only human. But when you let your feelings get in the way of actually taking action, that's the problem. So the question is, do you want to be controlled by your feelings and emotions, or do you want to control them?
