Moods are what make us uniquely human. Animals and humans have personalities and desires, but only humans feel and wonder what the meaning of life is etc. ;) It's just the way you are, and there is nothing wrong with it :)
Besides, you need moods to motivate you or make you calm and understanding for those who need a bit of empathy... so even if you think they're bad, it helps us socially :)
Just guessing this question was really a 'why do we have moods, i hate them' question.. so hopefully this helps...
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