College gives you a fresh start.
Have you applied to any universities? Are you planning on going for your Bachelor's right away? You're still in high school, so that means you have a bit of time to raise that GPA a bit. The high school GPA won't affect you in college, but it will determine what schools you get into. You could also do some of your pre-requisite classes at a community college, and then transfer over. Just make sure the university agrees to grant you credit for the classes you take.
I don't start nursing school until January, but I did complete all the pre-requisites to enter my BSN program. Nursing school is the last two years of a bachelor's program. You seem pretty smart, and I think you could do it.
How good are you at chemistry and biology?