Without any specifics, I (we) can't interpret what may be going on. But I will say, I had the blessing of having the "Clinical Drill Instructor" as an instructor for first level. Yes I said it was a blessing, I learned more in that 5 weeks of clinical than any other semester thus far, she challenged us, was thorough, fair, and very demanding. Yes, she made 2 students cry because they weren't sufficiently prepared. Yes, I got nervous about my knowledge of my meds, my careplan, the pt's disease process. It beats the tar out of what I am experiencing now, with an instructor that has yet to ask me a med question, about a disease process, or why I would do this or that to a pt with X.
At any rate, on the floor you'll have to deal with demanding, needy patients and families. And believe it or not pts and family will ask harder questions and comments than your CIs (with good reason), "what is this med?", "why do I need that?", "I take that at 8am, not 10am (or noon), why are you changing my schedule?", "it hurts to turn, cough, deep breath, I'm not going to do it", the list is endless you get the point.
One track you could take is to ask questions about your progress, get a feel of where the instructor thinks you are and if you are progressing. And finally, ask your questions in the med room not the pt's room, and always have a med book handy (that's real life). If your CI is like mine was you are prepared by the time you get to the pt room, put on your confident face and do what you've gotta do.