You are out of your friggin' mind.
Enjoy college.
Agree with this. You don't want to miss out on college. College is where you have the most freedom to try new things, the most time to socialize, have new experiences. In med school you will spend most of your time in the library or wards. A lot of the study skills and social skills you pick up in college will help you tremendously in medicine. And for many, college is a great and fun experience. You probably learn more outside of the classroom than in during those 4 years.
Once you start med school, you launch into the next phase of your life and your social life takes a back burner to your professional aspirations. So your teens/twenties are basically over (or at least scaled back significantly). People who want to skip past or abbreviate college for med school don't have a good sense of what med school is all about. You need to get college out of your system or you will spend med school lamenting what could have been, because that iron gate swings shut once you get to med school. There really is no rush, med school will always be there if you want it enough. But at 15 you really shouldn't want it that bad yet -- you cannot possibly have enough exposure over other choices, don't know your aptitudes, and probably have a vague and inaccurate sense of what medicine is all about. It is not like House or ER or Grey's at all.
Generally in the US, there are few to no programs where you skip college and go straight to med school. There are 6-7 year combined BS/MD programs, which are becoming fewer and fewer each year as the average age of physicians goes up each year, and the emphasis on life experience is increasing. And there are occasional prodigies like the 12 year old who went to Chicago a few years back, which tend to be more publicity stunts than evidence that adcoms are actually open to this. They are the rare unicorns of med school; you will never see a herd.
And med school interviewers focus heavilly on maturity. This doesn't mean no teenager will be adequately mature, but the average one sure isn't. And maturity has nothing to do with whether you can do the science courses. Most people with decent grades can, but that doesn't make them mature. It is an issue for the latter two years of med school, when you will be dealing with heavy subjects such as death and disease, talking with patients and families about hospice (end of life) care or DNR orders (pulling the plug), dealing with patients older than your grandparents. Dealing with dying children. Dealing with sexuality and sex practice questions. For this kind of stuff, a few more years of seasoning as a college student often make all the difference.
Other countries have systems where you go straight into med school from high school. They predate the US system, and the US system has largely rejected that model, striving for something very different in its med students. Thus far people are happy with the kind of physician we are churning out, and the average age has continued to climb over time.