You are (presumably) a human.

Without you, the world is merely a collection of things, with no collector.

A hammer has a purpose, when it is used (by a human) to drive nails.

A keyboard has a purpose, when it is used (by a human) to type.

A shovel has a purpose, when it is used (by a human) to plant a tree.

Without the human these things cannot be used, and do not have purpose.

You are not a thing. You do not have a purpose.

You are that which gives purpose.

You are purpose.