Hi! It seems as though you are very ambitious about working in the medical field, which is great!! My advice to you is to do exactly what you said and start volunteering in local hospitals. Which area interests you the most? There are a ton of local hospitals in OC that take volunteers right out of high school (St. Judes, CHOC, St.Joes, Mission, Hoag...just some ideas) I highly recommend that. I would also go to Santa Ana College and sit down with a counselor and map out the pre req classes you need so you can stay on track and get those done as soon as possible. Santa Ana will get you your ADN license, which is good, but with the competition in the Nursing job market, Id highly recommend you consider a BSN program. Some local schools that offer a BSN are Cal State Fullerton, Long Beach State, or private Universities like WCU or Concordia. These schools can be expensive, but at 17 you have not only Grant money you can use but are eligible for SO many scholarships, so use your resources!! Every school has counselors and financial aid help, so find which school interests you and GO FOR IT! Sit down with them and see which route is best for you. Also, taking the pre reqs at a community college will be a cheaper route. Just some ideas!
I know going for a dream can be overwhelming, but just do as best as you can and stay focused. You are still so young and have so much opportunity, so go for it! Good luck!!!!