The Joy of Smiling
This pearl of wisdom from Thich Nhat Hanh alludes to the possibility that ones joy is not dependent on outward circumstances and one can generate joy at will by any number of means. You are indeed in complete control of how you feel despite the misbelief that your feelings are at the mercy of circumstances. Have you tried generating happiness and joy from within despite outward circumstances? One way to do it is to simply put a smile on your face and rest in appreciation of whatever is good about the present moment.
How you feel is also the main component of your overall vibration and your vibration is what controls what you'll manifest by the Law of Attraction. So if you want to attract wonderful into your life your going to want to master generating good feelings.
Bring on the good vibrations!