I'm not sure anyone can answer this for you. If you dont have work experience in a healthcare role (HCA ideally or a carer), that might be a good start. Especially for your gap year.
For reference, im just a GEM med applicant (with interviews). I've seen countless posts online advising to avoid medicine. For me personally, I've worked as a physio for 10yrs and know the pressures of the NHS. I know unequivocally that I want to be a doctor and it's the only occupation I'm passionate about. Every doctor I've spoken to in real life, while acknowledging how difficult med is, has said they would never have chosen a different profession and love their jobs. Obviously the money is less than a finance role, but for someone like myself, it's a lot more money, even at just F2.
I've seen many posts online about those who have switched from med to finance, and that it's not an easy transition. And I've seen posts from those who have left and returned to med, or move to medicine from finance. The overriding sentiment seems to be medicine is just more rewarding. But there's plenty of people saying they don't miss medicine either. I don't think finance roles are a walk in the park, you'll have similar difficulty with long hours, difficult workloads and high competition.
It comes down to what your passion is. Which is an enormously difficult thing to decide at 18 years old. You can always apply for grad medicine if you study maths/accounting etc and decide it's not for you. And vise versa. I realise this doesn't answer your question at all, but i hope it was some food for thought.