I'm disappointment to my classmates!

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Something had happened in our class recently,which is about money and desire,which is something we always regard as a very sensitive topic and be very unwilling to talk about.They injuried each other just because of money.Many of them bacame the people that I didn't recognize.But someone told me that all of everything were normal.This was just life.You would face to the reality sooner or later.Really?I am afraid to think how I will become!what should I do now?