billions and billions of years ago the first lifeform was created somewhere in the universe, why it was created i don't know.
but all i know is that the meaning of life is nothing other than evolution.
nature has a balance i guess and humans are just a part of that balance.
any other reason for life is subjective to the lifeform itself, aka humans etc.
so therefore, make your own reason for living, instead of pondering why you live in the first place. it's a waste of time :p
so in conlclusion our existence can be either a coincidence or preplanned in nature from genetics and the way apes adapted to nature.

*shrug*