When you're sad, it's hard to find the positive in the things that are going on around you. But the more you practice gratitude and notice the positive things around you, the faster you begin to experience feelings of joy that replace the sadness.
Ask yourself empowering questions that begin to change your perspective. What are you happy about? What could you be happy about if you wanted to be happy? Who do you love and who loves you? What are you excited about? What could you be excited about?
When you face defeat, ask yourself, "What can I learn from this? What's great about this? How can I use this?" Questions like these change your focus and cause your mind to find answers that empower you.