Amethyst, I think what you are feeling is completely normal. I'm another new grad (~5 months of RN experience). There are days when I've totally got it down and really feel like a nurse and days when I can't believe I ever graduated nursing school
and feel like I have no idea of what I am doing.
When I first became a CNA several years ago, I found the first 3 months or so were horrible, I wanted to do a good job but I struggled every day and the work was brutal. Some where along the way though things became easier and easier, I didn't need to ask so many questions, I was comfortable in my work, confident in decision making, and felt like I was doing a good job.
The first 2 months of my RN position, I had a lot of rough days, there was so much to learn and some times really wondered what I had gotten myself into, but I leaned on that CNA experience to tell myself to give it another month or two and that confidence comes with time - and it does! I still have a lot to learn, still ask questions all the time, but my confidence is growing, my questions more refined, more and more I can answer my own questions by remembering where a resource is located, and I generally have more good than bad in any given shift.
Give yourself some grace - you are completely new, you are learning everything from coworker dynamics to nursing assessments, to how the copy machine works! You survived your first week of being a nurse! You *are* finding things about your job that you enjoy, and I bet you know more now about your working setting and patient population now than you did that first hour you set foot on the floor. Think how much more you will know in another week, in a month, in a year from now!
An important thing to remember is that any new job (dream job or not, nursing or not) is going to create stress for you, it can be exciting and wonderful and still create stress, simply because so much is new and your brain and your body are adapting to new routines and experiences. Recognize this and make space to process, de-stress, and incorporate activities into this new routine that help you recharge.