Happiness is a state of mind. You could have a million dollars and all the material things, a beautiful family and everything you ever wanted, and still be miserable. You could also be broke and riding a bike with a flat tire and love every minute of life. If you focus on the negative and how you didn't get that promotion, or raise, or your significant other left you, then you will be miserable. If you can appreciate that you are alive and healthy, that you have a job, a family or whatever, however imperfect they are, then you will find yourself smiling a lot more.