1. In life things happen, they always have and always will. Worrying about things that you cannot control takes far too much time and energy. Time and energy that can be used to improve the situations that you can control.
2. You bring everybody in church down when you go to the alter "frowned up" each and every Sunday looking like God can't do it. Maybe he hasn't done it because you don't truly believe he can. Walking in misery does not bring a blessing.
3. You give up your joy, and relinquish your power to the circumstance or the source of your discontent. This makes you a slave to your trouble and solves nothing what so ever. Ask yourself. Is a life without joy, a life at all?