Honestly, only you can make this decision. There is a lot of hard work that goes into getting into a program, then the program itself is rigorous. But if it is truly something you want to do, then it will be worth it. One thing to keep in mind is that the TV shows are NOTHING like real nursing. TV glams up medical careers because no one wants to watch what really goes on in a hospital. You get violent patients, all kinds of just nasty everything on you. Vomit, feces blood, you name it. Not everyday is a nasty day, but it happens. If you are unsure, start with a CNA. Most schools
don't have any sort of waitlist and only require basic prereqs. You could probably get the pre reqs and CNA course done in a year. Then work while you take the rest of the RN program pre reqs. This will give you a small taste of what it would be like to be a nurse so you can get a better grasp if you really connect with nursing or not. You don't have to be the smartest person, or the best in science and math. You just have to work hard to learn the material and be able to think like a nurse. GL in what you decide
ETA: ALso remember that because you just recently decided nursing is for you, it may just be a fad. I mean no offense in this, but you are young. In highschool you will fall in and out of love with a lot of things because of you maturity level and brain development (not a bad thing). So before you set in anything in stone, really think about it for a while.
Also, if you school offers off campus ROP class, see if they have a CNA course or something similar. Then it will be a free class that will count as highschool credits and you can start working fresh after highschool graduation to see if this is really for you.