Karma is not something pessimistic. If you think of karma as something wrong, you are seeing karma only according to what happened in the past. You look at the past and karma becomes a monster. So you should also look at karma in the present and future. Then karma becomes something very wide and really alive. Through karma you can understand what your destiny is. Destiny itself has no solid form; it's something you can create. You can create your life. That is why we study karma.