Freeandclear-I get where you are coming from, as I had the same feelings of 'everything is worthless, why are we here', going through my head for quite awhile after waking up. Yet, when you really think about it, according to the WTBTS, the ONLY purpose in life for the 6 or 7 billion people on this planet was to worship god. Why? That purpose is very, very limiting and discounts everything else anyone who ever lived did.
You can only affect people in the now. They can feel your love in the present...or your neglect. As an active JW, you were never supposed to live in the now, instead giving up your present for some imaginary future.
Maybe if you try giving more of yourself to others you can feel the satisfaction of now.