pale in comparison. 我的韩文不错，可是一和你比较就相形见绌了。

形：对照；绌：不够，不足。和同类的事物相比较，显出不足。 在整个动物界，任何一类动物与昆虫相比都相形见绌。 to prove definitely inferior; to pale before (or beside); to be outshone; to be inferior by comparison; to look sick; cannot hold a candle to (sb.)

Hello my name is Jessica and I live in France,I can learn you with pleasure french language :) If you're interest,You can join me by message,I will answer as soon as possible ^^I would like learn Korean language and as you're a korean...well,we can help us and learning together ^^ Thank you so much,take care.

no compare, no lack e.g. I think I am quite a good artist, but your painting put mine in the shade. 我原以为自己画得不错,可比起你的画儿来未免相形见绌。 (la référence from -- 英汉-辞典例句)

when comparing you will find one is worse.他一个部曹,戴了个水晶顶子去当会办,比着那红蓝色的顶子,未免相形见绌。——清· 吴趼人《二十年目睹之怪现状》