Honestly, even in my last semester I had times when I had no idea what I was doing. Some instructors make you feel stupid no matter what, and it's hard to get your confidence up with those instructors. I feel that even throughout an entire career as a nurse, there will be times when I have no idea what I'm doing. And that's okay, that's one of the beautiful things about being a nurse, you're always going to be learning new things. Something that I felt helped me was to have all of my assessments and things like that printed in my clinical binder so I could go over things before clinical started. I would also make a list of things my instructor was critical about so I could work harder on those (ie my stethoscope placement on a cardiac assessment was wrong, so I looked up YouTube videos on proper placement before my next clinical shift etc). I had a cheat sheet of sorts with all the head to toe assessments on it, lamenated, and small enough to keep in my scrubs
pocket so that way I couldn't forget any of assessments. Once you get out on the floor more, and get to do more "nursey" things, the more confidence you will gain, and any questions or things you are unsure of, got should be able to go to your instructor about. Their main job is to help you learn and become a better future nurse. You got this!