I so badly want to be a doctor, but . . .?

I've heard it's nearly impossible to get into medical school if you're not a genius Asian (not trying to be racist, just what I've heard). Like my cousin is reallly smart, has very high marks, nothing wrong with her at all, and she has been declined from med school 3 years in a row, applying to several medical schools. Also, I do not have a strong pion for ALL sciences. I am quite pionate about biology, but chemistry and physics not so much. I get ok marks in those cles (mid seventies usually), but I'm not all that interested in them. I want so badly to be a doctor in a hospital, preferably in emergency or adolescent psych, but it seems like it is rare these days to actually get into medical school. Anyone who knows about this, what do you think? Do you think it really is as hard as they say to get in? Any advice?