Got a B-, am I screwed

Hi all, I am a sophomore at Columbia University and am currently feeling very stressed. I don't think I can get into a single top 30 med school now. My current GPA is 3.75, I have got A's in all of my science classes except for Biology where I got a B- (A's in chemistry 1 and 2, physics 1, chemistry laboratory, frontiers of science, and physics laboratory). I also work in a research lab and am working on my 1st paper for publication; done prior research at MIT doing NMR work. I also have... Got a B-, am I screwed
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