Are you studying the psychology degree at Hull? You have to take their clinical modules to be considered for direct entry onto their DClinPsy, but no other training programme requires you to have taken specific units at undergraduate level. You need a BPS-accredited degree and ideally a high 2.i or better, followed by some experience in a relevant role. Most courses ask for a minimum of one year's full time employment. It's competitive but no means impossible, so don't write it off as a career just because you can't take the modules of your choosing.
However, you need to make sure you have a realistic idea of the training and the career. A lot of people have the mistaken impression that clinical psychology is a prestigious, well-paid type of counselling. It's academically rigorous with an increasing emphasis on research methods as you go, including statistics and quantitative methods. Some applicants are unprepared for the science and stats involved and see them as just an annoying obstacle to get out of the way before they get to the "real" psychology. If you're not enjoying the academic element, it's unlikely you'd flourish on a doctoral-level training and the career it leads to.
What is it about medicine that interests you? It seems like a big jump from clinical psychology to med, and if it's the competition that's putting you off psychology, not a very logical one. Medicine is just as competitive as the DClinPsy, and for GEM I think it's even more so. Most GEM courses ask for the same 2:i that the DClinPsy programmes want. Ask yourself what kind of work you see yourself doing in future. If it's direct therapeutic work with people who are experiencing psychological distress, then a qualifying MSc in occupational therapy, mental health nursing, or social work might be more up your street. In the meantime I think the best thing would be to focus on getting the highest grades you can in your degree, and reassessing after that.