@Deftil,
A question can only be relevant to the answer desired, else why ask the question at all! Questions are transient as there can be no definitive question or answer, because life is transient.
Who am I? causes much argument because it is open ended, and invites as many answers as there are recipients of the question.
What am I? Allows a more definitive answer, i.e. a finite living-being conscious of my environment and responding to it. As is true of all living things.
Why am I? Allows the most meaningful answer to our existence because in the fabric of life each thread can be seen, and its part in the overall construction of the tapestry understood.
From the waters of the oceans and its inhabitants to the ground of the land and its inhabitants, the womb to produce the offspring that is human was fertilized.
Why then was humankind born, when the pre-existing life of Earth patently had no need of humanity for its continued survival?
The answer lies in what that birth produced that no other birth
could produce:
Earth's ability to become self-aware through higher conscious for the first time.
As Earth's consciousness matures it is no surprise that its potential is only held back by the constraints of ego, vanity and greed.
We realize these limitations individually as we mature from child to juvenile to adult.
Free will allows these constraints; it also allows us the ability to break the chains that bind us to the short-term results of such pursuits.
But there is a time limit to what our common body can endure.
If it is overcome by the cancerous actions of malignant thought, then we will lose our common body's ability to support consciousness and we
will die, killing each other for what is left of the resources that once supported us in abundance.
This is not doomsday bell ringing and if any part of what I've said is untrue you will know it, and dismiss it accordingly.
But if the premise rings true then you will know that the power to alter thought is held by you, and that what you think is what will be.