This too shall pass. It sounds like you ordered the CS smorgasbord and are now feeling the fatigue of all the effort expended to wrap your mind around it. Like someone else said, meditate. Recognize that changing the world is a noble goal, but meaningful change is an incremental thing, and really, those that change that world rarely end up doing so because that was their intention, but rather because they followed a path they found interesting that just happened to lead them there.