I know the process absolutely sucks. I don't have an acceptance and am on three waitlists that in all likelihood will not turn into any acceptance, but I think you should try to let go of your bitterness. Going through this whole year of applying and getting a ton of R's while being fortunate enough to get a few interviews has been a hell of an experience. I think you can take that experience and feel bitter towards it or you can use it to fuel your drive to improve yourself and apply again. Like I said, it's hard, but I'm going to try to do the latter.