Do I have any chance?

Looking at MSAR stats and starting to feel like I don't have a chance to get into a decent med school.

GPA=3.7, MCAT= 510 (approx. 31 on the old test) but will retake
-Three consecutive summers of NIH research
-Dance at school fairly seriously/rigorously
-Have played violin 12 years (though no longer in a formal orchestra)
-Some volunteer tutoring inner city kids (about 60 hours)
-About 50 hours of doctor shadowing
-Attend a top 15 liberal arts school

I guess my main worry is a lack of...

Do I have any chance?