Welcome to SDN.
Absolutely agree with cj_cregg. The worst thing you can do in college is only look at a single career. You miss out on a lot, and when you are applying for med school, you will be asked "Why not dentistry? Why not nursing or PA? Why not a PhD? Why not any other job that is fulfilling, well paid, important, all the reasons people want to be doctors?" You should, at the end of college, have good answers. Saying "I've only ever considered medicine" doesn't make you sound determined, it makes you sound like you haven't put a lot of thought into your decision.
The four things from college that won't go away:
1. GPA (community college? 4 year? dual-enrollment in high school? med schools will see all of these. Average is 3.6/3.7 and regardless of if your school allows you to repeat classes to replace a grade, med schools will see all attempts at a class)
2. MCAT (Med schools will see all attempts, you can't just not send you scores in. Only take when completely ready. Average is a 508/509)
3. IAs/Criminal Record (Institutional actions are not, as some people think, internal methods of discipline to protect students from long-reaching consequences. They must be reported.)
4. Reapplicant Status (schools will see if you've applied to their med school before. They will see if you have been accepted to a med school before. Only apply to schools you think you could get into and are completely willing to go to)
You need other things like letters of rec, clinical experience, volunteering, leadership, but that can be done later. Those four things, if failed, can haunt you.