The part of my job that I don't like

There is a part of my job that I don't like at all. It makes me feel uncomfortable and unable to work as I would. Moreover I cannot understand what my bosses expect from me and which are my objectives what my objectives are so it is hard for me to manage this project properly. People working with me on this are a selection of the most careerist (ambitious) colleagues** of the company. I have the feeling that they always try to show how prepared they are and to denigrate other's another person's work.
I really hope that this project finishes as soon as possible.

** people, maybe. Becuase 'colleaugue' is usually a positive term, but it doesn't seem thaat way here ;)

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OK, I hope the project is almot finished!