I didn't have any connections as I'm a first generation college student so start out with volunteering at hospitals. Once you get your foot in, see if you can make connections to shadow some doctors.
Be flexible, be open-minded. Don't be afraid to ask questions about what adults like and dislike about their job. I made sure to try other fields before going to medical school to make sure this is what I truly wanted to do. Sometimes the experience outside of medicine is going to make you a better doctor in the future. Good luck!
I would suggest getting as much exposure to the medical field as possible. That can be through volunteering at a hospital, shadowing different physicians, and much more. Something I did over the summer was become certified as an EMT. I would then get first-hand experience with patient care.