I have a suggestion if you truly want to go to medical school. At many universities, and I'm thinking Johns Hopkins in particular, if you work full time in a laboratory, you are allowed to enroll in the graduate school for a Masters in Biotechnology without applying into the program. As an added bonus, the program will be free. I believe it takes two and half years to get the masters, and you get to take graduate level biology courses. Such a program will give you several things. First, you dont need to apply to grad school to get a masters, Second, you get extensive research experience AND you might get published, Third, you might get an awesome recommendation from a world reknown researcher, and Fourth, you'll get a masters degree and if you ace your classes, some schools will look at you AND it'll make you look better if you want to take a post bacc after that.
FYI my friends just walked into a lab at Johns Hopkins and asked if they needed help, and got research positions like that.