I agree with New Foundland and the other posters within this thread, to a point....
To the OP...
There are LOTS of other professional venues besides veterinary medicine where you can fulfill your calling of caring for animals. I personally don't think there's any shame in deciding that you gave vet school you're best shot, but it doesn't just seem to be in the cards. You know, there just might be something better out there for you.
Much as many of us wouldn't like to admit it, there are unhappy vets out there practicing in the world today. Unhappy vets who wished they would have made a different decision with their life, and if they had it to do over again, they would have made a different choice. I realize that this is little consolation to a person who has invested their whole heart and soul in gaining acceptance to a veterinary program- this is a choice only you can make. If you feel that this is truly the only career in the whole entire universe that can make you happy, than I say, go for it...go for it, 5, 6, or 7 more times...whatever it takes. Improve every section of your application, each time you apply. Never give up. If, however, you can see yourself being happy fulfilling your animal dreams in a tangentially related career, you may want to give that road a serious second look.
I myself started out wanting to become a veterinarian. It was the only thing I had ever wanted to do with my life. I surprised myself with research, and completely changed directions my sophomore year of college. Instead, I pursued an advanced degree in basic science. Although years of investment of research taught me that a life of grantsmanship and publication were not what I wanted for myself, I did learn that I loved the research environment, and that I did see a place for myself there. I also learned that I loved the regulatory end of science. 12 long years after earning my BS degree, I'm in line applying to veterinary school, in hopes of becoming a lab animal vet many, many years from now.
My point in telling that story is that there are so many directions your life could take. I do recommend that you think seriously about a life in research before you dive head first into that one. It's definitely not for everyone, and it's a serious investment of time and effort. Try it out before you invest. I wouldn't recommend it as an automatic 'Plan B' for someone who is thinking about an alternative to veterinary school. It is a great and natural alternative for someone who enjoys research, but not all folks do- check it out first. If it's your thing, go for it. Think about a whole array of options before you decide on any one course, and don't feel railroaded into applying to veterinary school any certain number of times if you feel that you've had enough. If, however, you do indeed feel it's the only course for you- by all means, apply your heart out- go for it. We're all here supporting you, and hoping you get the admissions decision of your dreams. Just remember to go your own road. OP, if you feel that you're ready for plan B, investigate plan B. If not, we'll be waiting for you in 2012-2013. Just remember, you're still in the game for 2011-2012.
Sending you my best wishes! If you've got any general questions about life in research, feel free to give me a holler