Do you love medicine? Are you interested in going through all the pain of residency and all the other stuff of medicine to be a Doctor? If you became a doctor and paid off your loans, and acquired FI, what meaning would you find in your life above and beyond the alternative, such as Doctors without borders, etc?
What I'm getting at is this: Do you want to be a doctor, FI, or both? For me, it's not about the FI and retiring from work, it's more about the freedom that that entails. I have no interest in not working, I just want to switch to work that I love doing, which has not been the jobs I've done for my life so far. I've enjoyed parts of my job, but not the whole of working, but I imagine there are jobs that not only would I enjoy doing, but I would find further meaning to my life -by- doing, so whilst I work towards FI, I'm also working towards attaining the skills necessary to do those jobs, and, free from the requirement to work, my employment takes on a whole different meaning, ya know? I'm looking at around ~35 if I stay in my current job, almost definitely having the ability to be FI, however I'm also analyzing the possibility of switching to going to college and graduating by the time I'm 30-32'ish, and having a large 'stash at that point to allow me the freedom to make life choices that are far more interesting then just FI... -not working-. I'm 25 now.