You just have to want something, don't you? Life's not life, really, if all your dreams come true. Without a carrot on a stick the mule of life won't budge.
You give yourself purpose or you're merely using up oxygen on the planet.
I've spent the better part of life so far pondering my purpose and all clues lead me to love. I will admit to a lack of effort in sport, business, art, and self-promotion. I have loved the best I could.