You're stressing about the stress of nursing and you haven't started school yet?
My advice is to learn some stress coping techniques now, or you won't have to worry about where you'll be when you graduate because you'll melt down.
Seriously, if you're going for your RN, you're going to enjoy a wide variety of areas to include peds, pysch, med-surg, OR, L&D, nursary, etc. and you can get a feel of what you're truly interested in. Who knows you might find an area that you currently are considering high stress but will wind up liking it. So why rule out areas when you haven't started school yet?
Try to relax and concentrate on school.