Are you currently working long term care? I ask because I have seen several new nurses get chewed up and spat out in a nursing home. My first job was in LTC and it was so hard even though I had a great mentor. I stuck with it and it all worked out in the end but I wouldn't advise others to start there. I wouldn't do it the same way if I could go back. I love LTC but 30 to 40 residents is too much for even a seasoned nurse. Add skilled charting, wound care, med administration, supervising staff, and unsupportive administration to that load and you have a perfect storm for burnout or even a trip to the board of nursing.
I agree with all of the others that said "it's pretty normal to feel this way". Nobody leaves LPN school ready to confidently handle every situation. Don't let these feelings keep you from RN school. There is a reason you wanted in to the field, just focus on that. Remember that there are MANY fields of nursing, maybe where ever you are working now isn't where you are going to flourish best (and that's okay!).