Why don't unhappy people keep their problems to themselves?

I'm unhappy because my child has ADHD and ODD. His behaviors are never normal and challenging. I'm bitter and angry as hell. However it's not other people's fault I'm in this situation. I try to keep my bitterness and unhappiness to myself.

What's up with others putting their issues onto others?

Why don't unhappy people keep their problems to themselves?
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