I think it's imperative to follow your heart and choose a profession you're passionate about, and if you haven't found that 'spark' yet, if you're not sure what you want to do with your lives - be persistent until you do.
Happiness is spiritual, born of truth and love. It is unselfish; therefore it cannot exist alone, but requires all mankind to share it.
When I was 18 I went to college for two years and didn't work for a year which was essential for me, because my identity had been so influenced by my being an actor and I think I just needed to discover what it was to be myself, divorced from all that responsibility.