You don't have to be a perfect med student to match DR - in 2022 the match rate for Step 2 score < 240 was 70%, for example - but a course failure, below-average grades, and a low-tier med school aren't going to help you. I agree that you should talk to your advisors, but rededicating yourself to getting strong clinical evaluations and an above-average step 2 score are probably required at this point.