karma theory is very complicated and often misguiding, if you are not helped by a real guru. Karma says that what ever you get here is because of your actions only. These actions may have been done in this life or in the previous lives. But it is definite to eat the fruits of karma. So, some people may think that doing any thing is waste as every thing happens as per the written law of karma and they are only the pawns in the chess.
But this is wrong as many gurus declared. Do your duty or karma without thinking of the fruit. If you do not help yourself , you will not advance , this is true.