I would not necessarily take it "personally" (that he doesn't think you'd make a good doctor) but would realize that he is/has been where you want to get to and knows the routines. I see my doctor 4 times a year and have seen him 5+ years and bet he'd still have trouble coming up with my name if he met me on the street? I have certain chronic illnesses he treats. My meds have not changed greatly in 5 years, some tweaking and some additions and lots of tests (twice a year) to make sure everything is as good as it can be and nothing additional has gone right

or wrong. It's not about "me", it's about my illnesses and the two of us work on them for different reasons; he writes prescriptions and reviews blood tests and I halfheartedly work at feeling the best I can feel; giving myself optimum health and caring for myself.
I don't know what you picture about being a doctor; but as "kind" as my doctor is, smiling very broadly when he enters the examination room and shaking my hand (no hesitation) and discussing (very very quickly, while he is writing out my next prescriptions -- which he sometimes gets my name or a detail wrong on, probably because we're also talking at the same time?) it's about the medical conditions, not the person. We wish it could be about us as persons, that they could see us and talk to us, but the costs of medicine and the time available just isn't there. If I raise a concern, if there's nothing to "see" (rash?) then it's being sent for more tests or having another prescription thrown at me with "try this".
I think a lot of the difference between 1950's doctors (I had one visit my home when I had the measles in 1956) and now is the same as the difference in "information" or "media". We just have access to so much and it is getting so much more complicated with opinions as well as "facts". Before, reference works were just "facts" and one didn't have to worry about whether it was true or not but now, the Internet and television has no "reference section" or librarian to help one out and we're forced to do a lot more thinking for ourselves.
Clinical rotation will mean heavy duty hours and a whole lot of stress; are you sure your body can hold up under that? I would do some research with bipolar doctors/students and make sure what I want and that I know how it might be:
http://studentdoctor.net/2007/10/hig...edical-school/
http://psychiatrist-blog.blogspot.co...be-doctor.html