What is the purpose of existence?

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I am wondering, very often, what if there is no life after death, no heaven, no hell if there is nothing beyond? What if the purpose of our existence? why are more living planets around a sun? Why is the forest green? why do we have a nose, 2 years, 2 eyes? Even if there are so many living planets, what is the purpose? Who is the creator of the universe and why?