what is the important factor of life ??

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whenever i thought about this i do not come to any conclusion bcz i had lot of problems in my life but i did not let it realize to any one that is why people could nt make a diffrence in my smile today they find me in a better situation bcz i am independent i have lost him 3 and half years bfor now i have to take care of my baby and also earn for our living now i am a single parent today my child is every thing for me but sometimes i thought when he will grown up he will be busy in his life i will be alone at that time what to do i dont understand let me know what should i do ?