It's hard to explain but when you have been born why do you have the parents which you do? Why are you born with a gender that you are? Why don't you get to pick? Because before you were born, there was nothing. You weren't a cat, or a dog, or a horse, or an ant, or a gorilla. You were a human and that's what you live to be. How come I was born to who I was? Because when you start life, you didn't have a soul, and immediately when you were born a person became part of this world, but to the exact parents they did, and they didn't get to choose. It's purely random