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You know well, God didn't create this world without reason. There are some (or maybe a ?) reason exactly. Sometimes you feel this world is not fair, it's gonna be, your mind builds the condition. God. World. Reason. Fair. Mind. Condition. Nothing's special from them, only words, you make the meaning.
You are running, and it keeps on, wanna stop? No, only God can stop you. You free to have your own mindset, your own style, your own attitude, but soul. You are only HUMAN of God.
Only God know the reason. The perfect and true reason, but you try to know, and will know, on your view. In fact, the reason on you is the key. You are good or bad.