If you're surrounded by people who treat everything as a battle and/or a game to be won, you have probably taken on a role in this game/battle play. Think about this. Are you an appeaser, a provoker, a joker, a victim, a rescuer or some other position? Most 'games' have roles that can be switched, or shifts where the game becomes a different game, so you could most likely identify two or three roles that always seem to be yours.
Look at how these games start. You should be able to spot opening moves, and even trace them back to before the move is made. There will be patterns.
By all means work some of this through on here if it will help. The main point, though, is that you can't control what other people do but you are in charge of your reactions. Interestingly, changing your reactions usually changes the other person's next move. Your goal is NOT TO PLAY. Instead of protesting, pleading, placating, etc, just give bland acknowledgements. Examples:
~ Hmm, I see.
~ Understood.
~ Oh, dear.
~ That's nice.
~ OK, let me know.
~ I'll get back to you on that.
Always do these calmly, neutrally, with no expression beyond mild interest.
If you get pushed around a lot, give bland refusals:
~ No, that won't work for me.
~ No, thanks.
~ I already said no.
~ Not today, I'll get back to you.
~ I can't help, hope you get it sorted.
Calm, neutral, firm, do not engage further.
If you have difficulty stepping out of position and feel your emotions rising, don't speak straight away. Breathe slowly and count to ten in your head - it's perfectly okay to make someone wait for a reply. You'll be surprised how quickly you stop being 'activated' by their nonsense.