More than one can handle with 荷が重い
The expression 荷が重い literally translates to “the load is heavy”. It is used metaphorically to express the feeling that a responsibility, task, or situation is too much to handle, overwhelming, or burdensome.
A similar idiom in English is to “have too much on one’s plate”.
Dictionary Definition
力量にくらべて、負担や責任が大き過ぎる。
The burden and responsibility are too great compared to the degree of ability to get things done.
Goo Dictionary
Examples
Too much to handle on top of class representative duties with 荷が重い

Tako and Azu tell their teacher they want to participate in the sports day relay race. The teacher points out that participants have already been decided when one of the decided participants chimes in.
- 生徒:
- 「私もクラス代表はちょっと荷が重いなと思っていたので…」
- “I was also thinking I have too much on my plate as class representative.”
- 「できれば代わってもらえたら嬉しいです」
- “I'd be happy if I could switch out.”