I get to feeling the same way. While being bitter and angry all the time is obviously not good I do think that we have good reason to be angry and that our sense of right and wrong would not be so sharp if we were not. The key is to channel that energy (because it does give you powerful feeling) into living a dynamic and good life.

"A doctrine insulates the devout not only against the realities around them but also against their own selves. The fanatical believer is not conscious of his envy, malice, pettiness and dishonesty. There is a wall of words between his consciousness and his real self." - Eric Hoffer