「左右为难」英文怎么说

（be stuck）between a rock and a hard place 左右为难，进退维谷

I'd like to help you but I'm stuck between a rock and a hard place. 

我很想帮你，但是我也是左右为难呀！

I promised my friend that I would go shopping with her but I still have homework to do. I'm stuck between a rock and a hard place. 

我答应了朋友会跟她一起去逛街，但是我还有作业要做，我也是左右为难呀。