Too much to handle on top of class representative duties with 荷が重い

Idiom Explanation: More than one can handle 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(せいと):: 「私(わたし)もクラス代表(だいひょう)はちょっと荷(に)が重(おも)いなと思(おも)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(か)わってもらえたら嬉(うれ)しいです」; "I'd be happy if I could switch out."