Zara, I'm so sorry you didn't get accepted into Cambridge. I know how frustrated you are. Keep your chin up girl, don't let this keep you down. Don't give up- you can do it!!!
Here in the US, there are only 29 universities with a DVM program . So yes, getting into a MD program is so much 'easier'.
As of right now, I am going through a Veterinary Technology program to become an RVT (california Registered Veterinary Technician). It is difficult, and requires me to do A LOT of studying on my own. We just started anesthesia today, and was told by an instructor that all of the things we have learned prior is to ready us for anesthesia. It's not easy, but I've wanted to do this since I was 2.

You are lucky you know what you want to do, and are actually pursuing your dream in veterinary medicine. A lot of people have told me 'Oh when I was a kid, I wanted to do that too!' But only so many people actually pursue it!

I have faith in you, Zara!!