Realize that happiness comes from accomplishment and personal growth, rather than from luxury products. Seek out voluntary discomfort as a way to become stronger, rather than running from it. Develop a healthy sense of self-mockery, and acknowledge that you are a wimp in many ways right now (and only by acknowledging it can you improve). Practice optimism. And of course, ride a bike.
Read the article: Meet Mr. Money Mustache, the man who retired at 30