Why are you so settled on becoming a doctor? Do you have volunteer or paid exposure already to patient care so that you know health care is right for you? Might be a good idea before you sign up for a path that will take the next 11-15 years of your life.
And even if health care is a fit, doctors are far from the only ones in the health field that help people. Physical therapists, radiology techs, nurses, speech pathologists, physician assistants, to name but just a few. Careers that don’t involve hundreds of thousands in debt and 11+ years of prep. Spend a few hours browsing on http://explorehealthcareers.org
If, after getting experience in patient care and thinking about alternatives you still think becoming a doctor is the right choice then read thru the very informative https://www.rhodes.edu/sites/default/files/PreMed_Essentials.pdf. There is also a good handbook at https://www.amherst.edu/campuslife/careers/gradstudy/health/guide and no doubt many other websites, as well as books.