what can u do when facing a frustration which can never be overcome,like death?

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These days,a consciousness are always spoiling my life.That's the fact that i will certainly be dead someday.i am only 23 years old,i wonder how i have such a frightened thought.i am so apprehensive that i lost interest in studying,playing,eatting,and even have no interest in expressing my affection to my girlfriend. i always think that if i were no longer alive,i.......... i really dare not and cannot imagine. it's such a abstruse question that i can never make it clear. Certain a philosopher put it this way:as soon as u think about the life,God will laugh. But who is God?Where is he? everything is of no sense. who can tell me the truth?who will do me a favor? i really need help!