I agree, but I would go as far to say that if you did not have purpose (or a porpoise) your options would be limited only by your imagination (in an equal society).
I feel it is my unlimited imagination that is part of my purpose.
It seems to me that if you find what you like doing, do it. Who needs some god figure to sanction that choice?
God only confirms what I feel is right, and let's me know when I am doing something wrong. Ever do something you regret? Well if I pay attention, he guides me through some of that stuff, so I can focus more on what will give me better returns, and fill that purpose for which I was created.
And no, my purpose is not to convert other people, but part of my purpose is to express the joy I have found in the Lord. I enjoy that, and do it well. This forum has been the toughest place to carry that out, but that is not the only reason I come here. I enjoy everyone in here, even with the difference of opinions.
It seems to me this purpose question is a red herring.
Don't read into it that deep. It's a coffee house subject, and we are just sharing our thoughts, that can't be a bad thing.