Keep your sense of humor. Whenever times get tough around you, just try to stay positive and look at the bright side of life.
This will help you bare the hard times, and appreciate the good times.
Think about the old saying, "I was sad because I had no shoes, until I met a man who had no feet". Looking at things from this perspective will keep things from getting you down and out.
When you are really feeling sorry for yourself, go see someone who has it a little harder than you do. Your visit will most likely put them in better spirits, and give you a whole new outlook.
Here's a funny little article that puts me in better spirits from time to time, How to Speak Southern.