You can only become a doctor with a relevant degree and training.
The first stage of qualification is undergraduate medical education at a medical school attached to a university. Applications to most medical schools are made through UCAS and should be submitted in the autumn of the year before the course starts. The standard length of this stage is five years. However, graduates may be able to take an accelerated four-year course, which requires at least a 2.1 degree, preferably in a scientific subject. A graduate who doesn't match these criteria could take an 'Access to Medicine' course.