I am so sorry to hear that. I felt the agony while reading your post and am truly sorry that you feel this way. I am in the same boat as you. I have been rejected post interview twice however, I only applied to Mcgill medicine. I know the stingy feeling and the doubts we have that maybe medicine isn't for me if so many doors close on you. I have thought this through as well and I know have the potential to be a great doctor however, I noticed a similar pattern in my post interviews. People who I thought didn't have a chance to get in, actually got in and people who I thought were def in, didn't. I reflected on this more since this was a continuous pattern. I realized that the people who I thought were 100% in were the ones who had a very understanding, kind and genuine personality and these are the qualities that are def needed to be a doctor. however, it seems like the interview process likes people who are cut throat just go go type people, sometimes almost inconsiderate of others feelings and basing everything on facts. I am by no means saying these people who got in went in medicine for the wrong reasons, I'm sure they did but I find after reapplying several times, people do turn cold to this process. it is no longer about doing medicine for humanity but rather doing it for the sake of getting in because you've tried so many times and its a dream career. I actually lost a very close friend of mine in this process who I felt used me to get insiders of the interview process and lied on every occasion when I asked if you are applying to med. I would have helped her for the MMI process myself if I knew she was applying but she was using my constant two years failures to her success and got in!
I myself am questioning if I have to become stone cold person especially because I am am empathetic person and by empathetic I mean, I literally feel others pain and am too selfless. I tend to put others before me on every occasion which makes me think isn't maybe they're looking for. in my opinion thats what a good doctor should do but maybe were supposed to be very factual, less emotionless people. You might have different thoughts on this however, just wanted to give my input; rationalize this daunty process and empathize with you.
I hope you feel better, if its something you really want, just reapply again so you don't have regrets later in life that you didn't push all the way through. find your weaknesses by looking at the applicants who got in, see what they have which might be a trait you may not possess. For example, I know am not an assertive person, I tend to understand others points a lot and compromise which is something I need to work on. Finally, if it doesn't work out, then maybe it is what it is and just move on! but don't give up too fast, a consensus is to reapply 3-4 times before actually getting in!