So i have joined an anonymous game and i am pretty scared (idk why). Its like i cant trust anyone. Any advices would be good thanks!

Dont be afraid , I seldomly lost any anonymous game (silver is a lose too)and my key was trust to players when they are all afraid to do deals and make alliance and also do backstabbing when you see fit (I dont do this in normal games )
The real difference is , players mostly are on the deal as long as they see profit in it . So dont look miserable

Ok thanks roozbeh!:)