You need exceptionally high GPA throughout high school, especially in all your sciences (biology, chemistry, physics) and math through calculus - all AP classes. Excellent lab skills. Premed admissions for university are extremely competitive now. You must be a truly superior student, and have additional qualifications. E.g. independent science research, winning science fair, etc. Or volunteer work at a hospital, nursing/rehab facility, etc. Start researching university admission requirements for premed programs urgently! You should have started investigating at least a year ago.
IF you do really well in premed at a highly respected university (minimum GPA 3.75/3.85) and score above 95th percentile on MCAT exam, you have a decent chance of acceptance at medical school. 4-year professional graduate school offering MD degree. Then you try to get placement in an ob-gyn residency, which is one of the more competitive residency programs.
Costs are the highest of any program you can study. Premed costs will be far higher than "average" costs universities publish on their websites as textbooks are more costly than average, lab fees for so many science courses, and other expenses. Average cost (all in) for 4-year bachelor's degree is $250,000. Even at in-state university, plan on that, possibly more. Med school: current costs for the 4 years run $500,000 and up. Loads of hidden costs!
E.g. friend spent about $50/week just getting all his dress shirts done at the laundry - he had to change his shirt 2-3 times a day, especially when doing his rotations. Yes, you wear dress shirts (with tie for men) in med school. Lab coats & medical student jackets, expensive to begin with, have to be professionally cleaned & pressed, too. Transportation to all your student rotations - reliable car, maintenance, insurance, tolls, etc. (NO way you can do public transit, especially at night.) Some of the costs you simply won't think of unless you get to know some premeds, med students.