I feel so useless!

Last Saturday, I went to a sweet,cute and bright 14 years old little girl's funeral. Even though she wasn't close to me, I could still feel the sadness. Seeing her picture...seeing her body lying in a coffin...no could stop their tears.
Yang: Well..At least you are not close to her.
Me: Ya..But I saw her in church. I remember her.
It was said to be a 'relatively simple 2 hours operation'. No one thought that this would happen. I feel so helpless. Looking at her parents grieve, its simply heart aching. She was so innocent and young yet she is no longer here with us any more. So sudden ..so surreal...
Sometimes i feel that if there's really God, he should have taken me away instead of her. I've sin more than she does. Why does it have to happen to her? If only they would have discovered her illness earlier..if only... i've been thinking so many 'if only's .It's all pointless now. It's all pointless.
I guess all i can do is to believe that she is no long in pain and she is with God.
To whoever reading this: Cherish what you have and the people beside you. There is no telling when will happen the very next minute.