I‘m out of your league,can`t understand you and you can`t understand me neither.
league也可以用来泛指某一类人,俗话说物以类聚,人以群分,有些人你一看就知不是和你同类的,这时你就可以说: I am not in his / her league. “be out of someone’s league” 也是个比较常用的表达法