You can be happy at work, even if it's just a job. Learn to change what you know: how the game of business is really played and how it affects your ability to be happy at work, how to judge what your company does right--and wrong--and how it affects your job. Learn to change how you think: how you contribute to your own unhappiness on the job, how to look at work differently. Learn to change what you do: how to influence your employer to make changes that will improve your life, how to find a job where you'll actually be happy.
Most of your life is spent at work--why waste it being unhappy?