What is the Self?

This is me rambling on what the "self" is. It will probably not make sense, and will be composed of some sentences and some sentence fragments. However, feel free to comment. All thoughts are more than welcomed!

Is it how we perceive ourselves? What makes the self?: Biology? genetics? society? Is it perception? For example, the Myers-Briggs personality test: it's based on our responses that we give to particular questions. It is colored/biased perception, responses. Is truth reflective of perception? Is truth our perception? But there has to be inherent truth, or else there is no absolute truth.
Perhaps the self is made? If so, would self-perception make our self? But then, what makes the perception? What we want to be? Who we want to  be? Society?
Is society the root of self?
But, then what makes society?: Human nature? Then what makes human nature? The brain? God? Evolution? Why are societies so different then. Since societies are different, then human nature cannot be the source of society, since human nature should be a constant through all peoples. Therefore, society cannot be the root of self.
What about forging our own destiny? However, our destiny is also based on our circumstances. So, do circumstances make the self? Probably. Our life situation, the one we were born into, makes us who we are. But can we ever truly transcend our situation in life? I mean, we can get fancier things, not starve, have better jobs, etc, and so forth, but does that change who we have become because of our past experiences? The brain is plastic, but is it *that* plastic?

Is human nature really the same across peoples, though? Let's assume it isn't, just for the sake of argument. Genes are different between peoples, so that would be the source of differences. So, then, evolution is the source of self? Evolution propagates mutations, which creates differences, which can create human nature, which will eventually create societies, which may create the self, at least in part. Does biology=the source of self?

What, then, are the ethical implications? What about psychopaths?

Going back to biology=self. So, if biology creates self, genius cannot be created or made. Genius is born of biology, but talent---what of that?Again, biology is behind all this. It is the culprit.
So talent is biology. However, the development of talent in a person is biology? What about circumstances, like opportunity and hard work and resources? But what if a person is lazy? Is laziness based on biologuy/ is that person doomed to never succeed unless they work hard to rise up against their biology (which then would be contrary to their nature,since they are inherently lazy and do not want to work hard).
But then again, are we just biological machines in the sense that we have primitive instincts etc and we are mostly run by the machinery of cells? What about free will? God? Spirituality? Is our destiny controlled not by deities, but by biology?
What if we say God is the root of self? Then is insanity God?

So, is it:
God is biology, biology is God? or
God is biology, Biology is not God? or
Biology is God, God is not biology?

Any thoughts on this from anyone?