you know
i never understood why puberty exists
why didn't god just make your voice deep and stuff at birth
Well, first off, god didn't make you or the human race. Sorry to break it to you.
Second, hormones control your development. There's simply not enough time in the womb for humans to fully develop, nor is there enough space. Thus, people have to develop outside of the womb. Part of development is diverging from a partially androgynous child to an adult of a particular gender (in most cases). It wouldn't make sense for DNA to contain two different replication algorithms, one for male and one for female. Instead, your DNA contains both as one and whatever hormone you secrete causes male or female traits to develop. This isn't to say that if you feed a baby boy estrogen his richard will shrivel up a vagina will develop, but the reason that baby boy has a richard is because testosterone is present in his blood. You don't receive mature loveual characteristics until a very high concentration of hormones have been present in your blood for a long time, which only occurs at a time when your body has developed in other ways enough to support new developments.