Make happiness your priority number 1. If being happy is not at the top of your list then other things will take precedence (Usually worthless things and stuff) If other things take your top priority, they may well interfere with your efforts to feel good.
So obvious, many people simple forget to do things from which they gain pleasure. So try to do them as often as possible. And remember – control what you can control. Accept everything that you can’t control. And learn to be smart enough to know the difference between things and happiness. Also check our Video about happiness. Check this beautiful infographic about happiness: