Okay, I'm not comfortable with the personal judgments going on in this thread, everyone is entitled to their own opinion. This forum is not, contrary to popular belief, about exchanging harsh judgments. Sorry, OP, that you're seeing this- shouldn't happen. Let's all stop throwing around the criticism and nasty tone, shall we?
Here's my experience on the job search: I graduate in 5 weeks and was hired into a spectacular position last week. It's not in my ideal area (I'm a Californian, this job is in the northwest), but the pay is excellent, the unit ideal, and the cost of living very, very low. I will have no problems at all paying off my loans and starting an independent life- and I'm only 21. Years ahead of most of the people I graduated with!! This said, I'd already put out 20 applications in California, of which half were ignored and half got immediate (like, ten minutes later) rejection letters. The economy was just beginning to crash when I went to college, and we thought it would get better by the time I graduated...well, it didn't. But it didn't necessarily hurt me any, so I think your chances are good, even if things stay crappy. If you want to be a nurse, be a nurse! If you're looking at a program that'll require 2 years of prereqs, even better- work as a CNA and see if you like it. (Though, I didn't, and it worked out okay for me.) This is your call, and the beauty of being in high school is that you have all kinds of time to figure it out :) Just leave your options open while applying to colleges.
My experience in getting into nursing: I knew when I was a junior in high school that I wanted to be a nurse, too, so I applied only to schools with excellent nursing programs. If you're not sure that a school has a nursing program, you can check online under the majors they have offered. Or, if you're getting confused (I know I was!!), call and speak to the recruiter directly. They can tell you exactly how the process works, which classes you need to take before applying to the major, etc. I've found that the collegeboard.com was a great resource for me, but it has been 4 years since high school, so things may have changed! Your teachers and high school guidance counselor should be able to help a lot.
Ultimately, it's your decision, and you have time! Keep your options open by getting great grades, good SAT/ACT scores, and taking classes that may help down the line (like Anatomy and Physiology instead of Physics, for example, and Statistics instead of Calculus), and you should be just fine.