Happiness is in your control.
Nothing you have and nothing you do is going to make you happy.
Happiness is a state of mind.
Do you want to feel happy? Ask yourself; what would I be thinking if I was happy? Remember the post about your thoughts determining your feelings? This is a prime example! If you can change your thought pattern then you can change your feelings; "I am unhappy with my career" -------> "I am where I need to be right now" or "I am working to change my career path". Putting a positive spin on your thoughts and circumstances can help make the elusive "happiness" a reality.
Remember, if you believe a thought it will create an emotion. The trick to believing a thought? Repetition! Repeat the thought to yourself, try to sit with it and breathe it in, the more you do the more believable it becomes!