This is pretty normal- you will learn more on the job in the first year or two as a nurse than you did in school, and you will find that a lot of the things you learned in school just don't apply in the "real world." Hang in there- as time goes by, things will get better and you will gain more confidence in yourself as a nurse. Just don't be afraid to ask questions or look things up if you're not sure about something- things will begin to become second nature to you soon enough!