Don't complain. If you are with a group of people that are all positive and you are the only complainer, stop it. Don't discourage those around you. Instead find a way to make it happen. The old saying that you maybe heard your parent's say: "if you don't have anything nice to say, don't say anything," makes a whole lot of sense. Be a positive influence and believe in the the impossible. It's where dreams come true. After all, it's the right thing to do and it models the way for others.