I want to refuse to pay a bet I lost.
Why would you refuse to pay a bet you lost?
Because I'm feeling bullied by the winner in the game.
Your friend shouldn't bully you. But they won the bet fair and square so you should honor it regardless.
I'm crying and complaining everywhere. Damn, they still wanna collect the cash.
It's not right to guilt trip them so you don't have to pay the bet. Just own up and pay them the money you owe instead of trying to go back on it.