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Don't stress too much about grades. They matter for people going into orthopedics or dermatology since those residencies are so competitive. If you are planning on a less competitive specialty, then just concentrate on learning the relevant information and keeping yourself healthy and happy.
I wish that I had known that a career in medicine gives you a broad skill set that enables you to go down many paths for your career, and allows you to pursue multiple pathways during the course of your career.