You mean that others help you prepare, which means that you feel bound by others.
This constraint mostly refers to the lack of freedom in work.
As for the coffin being ice, it may have two meanings.
First, the working environment is not good.
Another possibility is that you can change this situation with your own efforts.
Because ice can be melted, as long as you pay enough enthusiasm, you can solve the bondage of work and have a new world.