These types of situations normally require an edge of diplomacy. Not knowing why you are unhappy is difficult to give concrete advice. Conflict, be it at work or pleasure, can be managed and overcome, but not on your own, in a darkened room: you'll only make yourself bitter and exaserbate the problem. There are also books to consult in dealing with conflict and difficult people/situations.
I would say th the following is the best course of action.
(a) Book an appointment with a necessary senior figure. Don't immediately go to the top man, but perhaps a moderator, and explain you current issues. You could ask for an off the record informal meeting. You should go into the meeting with an open mind. Have a number of options/suggestions up your sleeve. Don't go in guns-blazing and complaining. You'll want them to help you come up with a plan to help you out. Above all, you must explain your issues (but do this diplomtically, and if it is a character clash thing, then tread carefully).
(b) Work out a schedule of actions. Place the actions on other people to come up with a solution. Arrange to have a follow up meeting a few days later. Agree and be willing to compromise, but make sure others have agreed and will take some actions.
(c) If things are not forth-coming, escalate it to the next level, and do the same as above.
I would urge you to take stock of the situation - do not blow your top, confront, or take an agressive standpoint. Gain advice from other neutral third parties (friends etc) and ask them to look logically/objectively at the situation. You also must look objectively, and come up with reasonable alternatives.