Say something positive. There are hundreds of little things you can do to show kindness. Try to understand what others are going through. Look at life through their eyes. If you empathize with someone's feelings, you can help.
People get tired of listening to constant whining.
Life doesn't always go the way you want. Learn to accept what you can't change, and work hard to change what you can. Replace the time you used to spend complaining with time spent being kind. Never give up. Even if you are faced with negative, closed-minded people, never give up.