A gap year can sound daunting but you should consider it. On the other hand, you could just not apply in year 13 and focus on finding work experience and volunteering for a medical application. Even if you didn't have a job it would be a bit late now to do work experience or volunteering as medical schools like to see a long term commitment. You could speak to your school and see if they would let you not apply with the rest of your year and instead apply the following October.
You could also still apply to a biological degree at somewhere that allows you to intercalate into medicine after a few years and then go into it that way.