Purpose in this world

What is my purpose in this world?

What was I put on this earth to achieve?

That overall thing that I should do for the world or add to the world?

What is it that will enable me to find out what my purpose it?

And if I think I know what my purpose is, how can I be sure I am right?

And when will I be sure I am right once I have began on it?

And how will I plan such that the purpose can still be fulfilled even after me?

Or can I get other people into my purpose? But don’t they have their own?

And how can I ensure that I work towards my purpose each passing day?

How can I integrate it into my every waking moment?

How can I ensure that I stick to it religiously?

And how do I even begin?