You are never under any obligation to do anything.  Ah, yes … you have your rules, and of course
you must pay your taxes, you joke.  But
these are human obligations.  As the
spirit-being that you are, you are under no obligation to DO anything.  You could simply sit back and BE for your
entire incarnation, and that would be fine. 
You did, however, come here for a purpose.  “Oh, please tell me what it is!” you
cry.  Your soul knows the answer.  Why don’t you ask it.  You heart will reply.  On a smaller scale you fulfill your purpose
when you find your passion.  On a larger
scale you fulfill your purpose when you love. 
It is that simple.  Be.  Love. 
Why make it any harder?