Welcome, WTBW! I'm impressed that a young man still in medical school would be paying ANY attention to this stuff, you're well ahead of the curve. We have quite a few docs in the house (@PoF @Dads_Dollars_Debts and others), and it's certainly a very viable path to early retirement (check out Physician On Fire's approach, he's going part time in a few months!).
Keep your nose to the grindstone, good plan to live off your girlfriend's check, and listen to @TheGreenSwan about the Lifestyle Inflation risk. Don't worry about your fellow docs driving those new Mercedes, live your own life. Good luck, and welcome to the nut house!