Switching From Medical School to PE (Any advice is appreciated, thanks)

I am a senior at a state university that has been accepted to multiple medical schools for the fall of 2020. I have begun to realize that I pursued medicine simply because of the academic challenge and financial stability it offers rather than it being what I genuinely want to do.

I have always had a keen interest in finance, which is why I chose to major in it. I am about to graduate summa cum laude (3.94 GPA) with a major in Finance (real estate emphasis) and minors in Biology and Chemistry. However, due to my medical school ambitions throughout undergrad, I have no work experience in IB or PE; I spent my summer and winter breaks volunteering, working in hospitals, and performing research.

Is there anyway that any IB/PE firm would hire someone with no work experience in the field? Should I try to obtain an MBA and then bust in? For what it's worth, my grandfather was the managing partner of a PE firm before retiring several years ago. I have no interest in in using nepotism to land a position at that firm, however.