Happiness is a choice, yeah, things in life make it difficult, but at the end of the day you control your own happiness.
Happiness isn't a place in time, happiness is a state of mind. Don't let your bubble of happiness be burst because of anything that occurs in your life. Rather than making happiness your aim in life, make being happy your aim in life. Do things that you know are a part of you, and that help to show to the world who you really are.