Congratulations on starting your college-bound process! I'm impressed with your proactivity.
There are accelerated programs of study in the US that shorten the time to completion of the MD degree: https://blog.prepscholar.com/ba-md-bs-md-programs-list.
I, and many of my colleagues, however, caution students regarding this route. Here is a recent article that articulates why the apprehension: https://www.usnews.com/education/blogs/medical-school-admissions-doctor/articles/2017-09-05/gauge-applying-to-accelerated-medical-school-programs.
That's in the US. Europe, South America, and other parts of the world have different models of higher education for medicine with students entering directly into the program after secondary.
I would recommend researching the options in relation to your goals and expectations of both the undergraduate and medical school experiences. It seems like a long time now, but that time will pass quickly!