But that's the thing: How do you know you'd react any differently with the same exact life experiences? You can't know how you'd react if you'd lived Harry's life because you wouldn't be the same person you are.

Also, that was an important aspect of Harry himself: luck. He wasn't supposed to be super smart. He was special by circumstances, but he was supposed to be fairly average outside of that and luck is what got him through most situations, if not his best friends helping him (mostly Hermione). He was actually supposed to be very normal.