Soliloquiy take heart! I'm so glad that you are having this realization in school, rather than a total reality shock and no foreshadowing before you land your first coveted nursing position. Not all days are rosy. Most are the "new" average. A few are downright nasty. As Pinknblue82 pointed out, "this too shall pass."
This is a great time to look into YOUR coping skills, and what you CHOOSE to spend your precious, precious energy on. Sometimes there is no rhyme or reason, and the only thing you can control is your response. See the duck, be the duck. Recognize the pond you're in, let the water roll off you as best you can, and keep paddling. You can do this.
Regarding the realization that you HATE the business side.......well, that is isn't going to change. Realizing you need to be more assertive, you're on the right path in that, first of all, you recognize this. Next, go ask for examples of what your instructor wants to see. Then do it, learn from it, decide what parts of it you want to keep, and discard the rest.
Now....to your specific question...my opinion is to say to your staff nurse with whom you are paired, "I was thinking X would be a priority to get accomplished in the next hour, and after that I thought I'd work on X and Y. What do you think, and what else can I do to help you with this/these patients?" Then let your instructor know how you handled that.
It's all part of the process. Write a sticky note to yourself about this and file it away to look at six months from now. You'll be most likely be smiling at how far you've come!