Us humans have the need to fulfill every area of emotion there is. You ever get mad at somebody, and get over it too fast? And you think to yourself 'MAN! I WANTED TO STAY MAD A LIL LONGER THAN THAT!' Or maybe you've felt sad and actually WANTED to wallow around in your sorrow because its a zone of comfort. It's human nature. We tend to want to feel every type of emotion there is, whether consciously or subconsciously. Another example would be our wanting to go see a horror flick. We WANT that fear, as long as it's controlled and sustainable. However, to maintain a healthy being, happiness should always be the regulatory emotion. So if you tend to get down for whatever reason, don't try to convince yourself that you're not down. Understand and accept it. If ever you feel the need to cry about something, let your tears flow. However, you must tell yourself 'Ok, life's got me down right now, but this is only temporary and i accept. I know I won't be down forever, and most likely, i'll laugh tomorrow.' Learn to master your emotion. Understanding grants you the ability to control. Grab hold of your thoughts, learn them, and accept them. It will be then, that you will have a tighter grip on life.