The only way to shorten the degree beyond those noted above (which is essentially, you cannot) is that a very select number of schools offer a formal pre-med to medical school program that shortens the pre-med to 2 years. This structure is more common outside of the US where there is less diversity around the high school experience and what students are actually taught (and for many of those countries a national exit exam is used).
However, some schools offer accelerated programs that high school students can apply to. Once accepted into these programs, students typically complete 3 years of undergraduate courses and then 4 years of medical school courses.
Another way you could "shorten" the process is by graduating from your undergraduate program early, which is what I did. But even though I completed college in 3 years, I had to study and work harder than my classmates during those years. In the end, I still had to complete the same number of courses, just in less time, which potentially required even more effort.
Studying to be a physician is a long journey and takes hard work. There is no rush, and if you are truly passionate about medicine, you will enjoy the hard work and your efforts will be worth it!