I totally understand how you feel. I learnt how to play the politics game the hard way i.e. I thought working hard and doing a good job was what counted and oh how wrong I was! That actually makes you a bigger threat! It sounds like this is what you're finding out (sorry to hear that, I know it's awful and very disillusioning).
I worked somewhere so unpleasant that I can't even begin to tell you how any times I locked myself in the Ladies in tears, or was in tears in the kitchen and on a couple of occasions even at my desk. Our company GP prescribed me Xanax several times (it tells you something about the company when we had a GP sitting in our basement). But you cannot let these fckers win. It took me time to get my game together but I came back fighting. Now I'm very politically savvy and don't open my mouth or take any action without considering the consequences first (and adjusting where I think I need to). I protect myself, my team and my boss/my client at all times but I maintain my integrity and will do "the right thing" no matter how much it psses some people off. I just make sure I can back up my rationale my clear, objective evidence.
As a result, my career has really taken off - an unexpected benefit I guess.
Most of my job now is about politics or manipulation (a.k.a. "stakeholder management"
) in order to get the results we require. The downside is that I assume the worst of everyone. But the upside to that is that sometimes I'm genuinely pleasantly surprised when people do nice things.
Whatever you do, don't let the work sociopaths/psychopaths intimidate you or upset you. You just have to try to switch your emotions off and focus on your job. And, as my deputy always says to me, "CYA" (Cover Your Arse).
As an aside, I do voluntary work one day a week with animals (at a wildlife hospital) and it does me the world of good mentally. No politics, no backstabbing, just hard physical work for a good cause. Finding an outlet away from work helps keep my sanity.
None of the people I volunteer with have ever even asked what I do for a living. Seems weird when my job is such a big part of my life but it's also good to be around people who haven't sold their souls to the devil for their careers 