|Akhenaten, Nefertiti and their children under the Aton|
No human being has ever made the decision to exist. Nobody knows why they exists, nobody knows what was before and what comes after this existence.
Of course we can speculate we did choose to exist, but still we're just using this mind and the ability to think and imagine to speculate, it is never the Truth. We can also speculate by looking at what was before us, rocks, fossils. Or by studying other life forms, or the outside emptiness of Space. We also try to anticipate the future by imagining or calculating odds and probabilities.