Forget Being a Toys R Us Kid!

I'm pretty sure I've decided that the purpose of my life is to slowly find out what I dont' want to do with my life.  I know most people start with what they want to do in life and move forward to make that happen but every time I think I've found a career that could bring me joy for years to come I quickly realize that if I actually had that magical, fabulous career I would hate my life in a year or two.  

How do people know what they want to be when they grow up???  And I'm almost 29, aren't I grown up enough yet to have a life plan???  I hate that stupid question, where do you see yourself in 5 years?  I don't know, the same exact place I am now, the same place I've been for the past 4 years specifically or 10 years generally.  Grrrrrr...all I need is a little direction...