why don't we to be happy everyday?

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sometimes we don't have good mood,but really we have to be sad?i think we needn't to be so.because our life is not so long as we think.it is just about little than twenty thousand days.so we have no more time to spend on these little things,and then just forget them,let by-gones be by-gones.and then you will find that our lives are so beautiful.