Christians: I need your help please?

My grandma was only 50 years old and she was such a generous person. She did so many good deeds and not once did I ever see her commit a sin. She died in a car accident which makes me question God's existence. I'd believed in God up until now and when I see so many moral evil in the world it hurts me to see... show more My grandma was only 50 years old and she was such a generous person. She did so many good deeds and not once did I ever see her commit a sin. She died in a car accident which makes me question God's existence. I'd believed in God up until now and when I see so many moral evil in the world it hurts me to see that they aren't dying but my grandmother did when she did nothing wrong. I haven't told anyone about this, and I wouldn't want to. Because i'm afraid they'll think I'm going mad. Is this a stupid reason to loose my faith in God and what can I do about it. I'm 16 by the way.
Update: I did read the story of Job by the way.
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