If you feel justified in your anger, ask yourself if holding onto it is truly benefitting you. When thoughts of when you were disappointed or disappointed yourself travel through your brain, immediately remind yourself of a time when you were successful or felt happy, inspired, or loved because of another.
Noticing and appreciating the people that bring joy and love to our lives is another way to avoid contracting the Angry Bird Syndrome. Thanking someone who has been particularly kind to you allows another to share in your gratitude. If you're looking for something more personal and instantaneous, consider keeping a gratitude journal. Write down what makes you smile, big or small, include crowning achievements, touching moments and great aspects or experiences of positive personal relationships. Giving yourself time to reflect on the positive aspects of life reminds you to slow down enough, even if only for a brief time every day, to stop and truly smell the roses. No wonder sending flowers to those we love has never gone out of fashion.
Think about the advice you'd give a friend who was worried, and give yourself the same hopeful advice and encouragement. One simple rule is to ask yourself whether anger is making you feel righteous. If that sense of righteousness does not immediately lead to positive action, it's not righteousness you're feeling - it's an overinflated sense of ego. Ego causes us to take things too seriously. Be mindful of your reactions. The expressions on your face will give you away. If you're frowning instead of laughing, recognize it and forgive yourself for the infraction - then move on.