I agree with much of the advice that has already been given; I think it's very important while students are in school to talk (and shadow! Shadowing and interviewing should be done concurrently in my opinion) not only with professionals but to the students in front of them. In your case, this would be residents and fellows, etc. Volunteer work/ internships and personality assessments can all be useful... But I think the thing you may really want to hone in on is, what is your reason for saying you're not sure if what you're doing now is really the path for you?
Ask yourself what the nature of your concern is. Do you feel you might be more interested in other fields, and that you may be pursuing it because your family is in it? Are you unsure about the schedule? The debt? The time commitment? I think the key to discovering whether you should stay the course or make a change starts with finding the root of your uncertainty. From there you can sooner decide whether you can satisfy your hesitation within medicine somehow (ex. By gearing yourself toward a particular specialty that may be more of a fit) or whether you'd be better served to pursue something new entirely.