This is really big question you ask.If we see dead body,there is something inside us thar keep the body moving.It is sctually a soul in our body and every other living entity.So if soul is there so there must superl soul or god who made this soul.He is supreme lord krsna.We are his son or servant anf our task is to serve him.When he will be happy automstically we will be happy.He loves us so much. We just forgot our supreme father that is why we are suffering and going through birth,old age,disease and death in each life.It is going on.We have to connect with our supreme father only then we will be in true happiness.Most easy way to connect to our supreme father is call him lovingly with this maha mantra -hare krsna hare krsna,krsna krsna hare hare
Hare ram hare ram,ram ram hare hare.Whereever you are just chant this mantra.It definely relieve your pain inside you are suffering,gives you peace tranquality & happiness.You must read Srimad bhagvad gita as it is to remove your all doubts,questions about life,death,suffering,karma all 
buy it from amazon in your country in english and or in your language.
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thanks @gaurang, i respect your religion and belief, however i am a christian and in christianity we call our supreme God who is the creator of the universe and the Giver of life Jehovah.
However i do study other religions and i totally agree with your belief as regarding the soul of every being, thanks for the book recommendation as well, i will review it.