Sort of a complicated question, I'll try to ask. How was I born me and not another?

[Arkilogue]

The key here is the trajectory of "me" based on the accumulation of experiences both objective and subjective, conscious and unconscious.

If you had different experiences or made different choices, you would be experiencing a different self identity.

Which is basically just saying, "If you weren't you, you would be someone else."

Not quite, you would be a different branching version/potential of yourself, but it would not be the exact same self.

And how much of "you" is determinable by you? If I had chosen to master business and make millions a month I might think of myself either a self made genius or a parasitic opportunist of the system, on the much larger other hand, my employees might consider me a god send or a devil. Who/what am I?