I'm very curious about this.I'd like to hear/read the details of what you are being criticised about. It is unfortunate that you find yourself in such a difficult working environment. Definitely you have not had enough orientation in 6 shifts. My facility also kind of throws new folks "out there" too but the rest of us are very supportive and try to be helpful.
Two things to keep in mind: Cliche as it may sound you've surely heard it said; "Nurses eat their young". I deeply disagree with the notion but have found it is common for whatever reason (probably insecurity and personal unhappiness) for older seasoned and (obviously bitter) nurses to be less than supportive/helpful to new ones. BUT not everyone is that way. Do your best and ask for help. Find good people to befriend.
Secondly, don't get too sucked in by the negative venting and "beware of the administration" warnings that the senior employees can dish too much about. Like rumors, the stories can cause you unnecessary worry and may not have that much truth in them. I remember being very fearful of who to trust and who had it out for me when I started. Probably it is a little bit that way whenever you start a new job. If you are really unhappy then I agree with the others, you should leave. Life is too short to hate your job. BUT if you like what you do then look at each individual circumstance and think about solutions. Do you feel unwelcome? Talk to people. Why are they making you feel like they are against you? Is it a misunderstanding? If you are making mistakes ask for more time with a preceptor. Show that you are trying to understand. Psychnursing is hard and there's so much about it that gets better with experience and confidence in yourself.
And lastly... I think that most institutions are kind of 'all about money'. Sadly. When you are working on the floor, in the trenches, most of the administrative decisions seem ridiculous and defy logic and common sense. We're all frustrated by that. If you are not, then you will go into administration yourself one day, where its about money and politics.
Good luck. Keep talking it out.