Ok, I'll give you some advice that I received which is quite realistic, if you find it hard to decide between being a doctor or a vet.
If you want to do medicine and become a doctor:
"It starts with the patient, continues with the patient, and ends with the patient".
Hippocratic Oath: (for a doctor)
1) i will respect the hard-won scientific gains of those physicians in whose steps i walk, and gladly share such knowledge as is mine with those who are to follow.
2) i will apply, for the benefit of the sick, all measures, which are required, avoiding those twin traps of over treatment and therapeutic nihilism.
3) i will remember that there is art to medicine as well as science, and that warmth, sympathy, and understanding may outweight the surgeon's knife or the chemist's drug
4) i will not be ashamed to say "i know not", or will i fail to call in my colleagues when the skills of another are needed for a patient's recovery.
5) i will respect the privacy of my patients, for their problems are not disclosed for me that the world may know. most especially must i tread with care in matters of life and death. if it is given to me to save a life, all thanks. but it may also be within my power to take a life; this awesome responsiblity must be faced with great humbleness and awareness of my own frailty. above all, i must not play at God.
6) i will rememeber that i do not treat a fever chart, a cancerous growth, but a SICK HUMAN BEING! whose illness may affect the person;s familiy and economic stability. my responsibility includes these related problems, if i am to care adequately for the sick.
7) i will prevent disease whenever i can, for prevention is preferable to cure.
8) i will rememeber that i remain a member of society, with special obligations to all my fellow human beings, those sound of mind and body and as well as the infirm