why am i here?

When i pray to The lord sometimes I ask him why, why does crime go unjust, and do child molesters lust, why must innocent four year old's die, why must people lie, why do cancer patients hardly survive, why in this life do we feel so much pain, why when were depressed does it rain, why do people on not have enough to eat, how on earth murderers and rapists sleep, I ask why they did what they did and why are we only truly happy when were a kid, i ask why am I here, and why do live in fear, why do fathers leave, and then how in this world of so much pain how am I supposed to believe?