Don't rush! Use your existing college credits to lighten your course load in college and do things other than study and take classes.
- It's far more important to admissions officers that you do well in your college classes (high GPA) than that you finish early.
- After that, you'll need a high MCAT score, which you're far more likely to get with the proper coursework behind you and appropriate dedicated study time.
- After your numbers, your ECs are next in line. You'll need time to build up appropriate levels of community service, medical experience and demonstrated leadership skills. Running through college too quickly simply doesn't allow you the hours needed to build this area of your resume.
In short, even though you CAN graduate early, it's not always wise to do. I'd advise taking a slightly lighter course load so you can keep your GPA up and focus on ECs and research. Then apply after two or even three years instead of one. You'll still be among the youngest in your class -- which will be a disadvantage.