When people see someone who smile all the time they will have this thought, "ooh! this person doesn't have any problem at all, he or she smiled a lot, it seems see gat everything she ever wanted" but in reality it is the opposite. They choose to smile all the time because it is easier than explaining to everybody why they are sad.
Explaining things to people is not easy because no matter how much you explain some people will still not understand you even if they happen to understand, they won't be able to help with anything they will only use your matter as a topic. The pain will just be the hot topic to discuss just to have fun, so it's better to keep a smiling face to avoid explaining to people that doesn't deserve to your explanation.
Thanks to @flaxz for the initiative of #iamalivechalleng.
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