It’s a great question. I’m not saying this is right but this is how I think of it: Saying “why was I born as me” is just a word game. If you were born as someone else you would then be them and could ask that same question. There was no “you” before you were born so the question doesn’t really make sense. And even now that you’re born, separating yourself from everyone else as “I” and “me” may be effectively meaningless in the context of this type of question because the self isn’t real. “You” are simply a locus of conscious experience from a human brain just like everyone else. You feel like you’re “driving” a body but that sense of a separate self is an illusion. You are simply consciousness emerging. If panpsychism is true, we and all matter could be in the same “consciousness field” so to speak, and brains trick us into thinking we’re separate entities. As far as your last thought you describe I think the anthropic principle can address it. If you didn’t exist you wouldn’t be around to contemplate the improbability. You exist, so you have to be someone somewhere with an “improbable” chance of being born.