Perhaps you are in touch with some of the people who were graduate students with you. Talk with them and see if they have experienced the same feelings you have and find out what they have done about it. You can't be the only person to have encountered the situation you describe. Talking with others and learning what they did may help you see some solutions for yourself. However, if you have lots of colleagues who are similarly disillusioned, this in itself may be part of the problem.
Departments can develop cynical, negative cultures that are downright toxic.
This may mean meeting some new people. I don't mean to minimize how truly awful some work situations can be, but if your goal is to move to a better situation, spending time with people whose coping mechanism is sophisticated whining won't get you anywhere but down. If you conclude, however, that you want to change jobs or fields, you may be looking at a longer-term strategy. You can do it on your own, but it is very beneficial to have an objective, experienced professional help with the process. For ways to identify career counselors to help experienced people, see our column on career advice.