Don't worry about the first two years of high school. Just step it up the last two years, do well on the SAT, and get into a state university. Take all of your science/pre-med type classes at the university. To save money, you can take the other classes like English/history/government etc. at community college during the summer. Assuming they still have AP tests, you can study and take some AP tests and place out of college classes = a lot less money. I went to college with 18 hours just from taking those silly tests. Just make sure you keep your college GPA high, and study hard for the MCAT. Study hard, lay off the partying in college, and you'll be fine.
When you do get around to med school, stick to a school in your state, or go to a state that has cheaper tuition. Texas, for example, has great tuition rates and cheap cost of living. 95% of med schools are great, and there is no need to go to a hyped up school and graduate $300,000 in debt. Emergency medicine is a great field, where residents on average only work 50 hours a week, but keep your options open as there are lots of great fields out there. I am like you in that I said way back in high school that I wanted to go to med school and be an anesthesiologist. Now I'm in my intern year at a very good anesthesia program. I did well in high school and college, but by no means did I have a 4.0 gpa in college. It's a long, tough road, but if your heart is in it then everything will work out. Getting into med school is not all about grades. Med schools like to see people that participate in extracurricular activities and have some volunteer work and shadowing experience in the medical field. Do all of these things and you'll have no trouble.
I love to help with this stuff because I've gone through all of it. It may seem scary and dramatic now, but 10 years from now nobody cares how you did in HS or college
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Out of curiosity, where are you from??