in fact i think life is always disappointing!but why?

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this morning when i was doing my normal job my boss told me that what i have done was all in vain including the investment he put in the project,so i began to realize that my hard work turns to zero again and all the time i spent was a joking finally !my!is that life is full of disappointment so that man can fall off from the happy valley and that is what life enjoy?i dunno why?once i feel disappointed i just wanna ask why,life should be colorful should be sunshining but all these hope fade up this morning....