If your heart is not in PT, it most likely never will be.
With that being said, there is plenty of crossing over between medicine and physical therapy, and you will be able to obtain good medical experience while working as a PT, and while on your clinicals. You may find, like I have, that PT is semi-fulfilling and just a small taste of what you REALLY want to do. You delve deeply into the medical, scientific and etiologic aspect of cases while shunning the PT interventions. Your patient education involves in-depth description of the arthroscopic Bankhart repair to the patient, and percentages of success/failure rates, because the ortho never did. You dislike the fact that, outside of therapeutic exercise, most of our interventions are theoretical and unsupported or downright disproven by the literature (ultrasound, diathermy, e-stim, iontophoresis, etc). Not to say that exercise is wrong, but it does not require 7 years of my life to learn to instruct it correctly.
Make sure you have all the pre-req's covered; my PT pre-req's were taken with School of HP and not arts & sciences, and unfortunately most med schools won't accept those classes as sufficient (chem, A & P, biochem). I am currently taking all the basic pre-req's while practicing as a PT (have been a PT for 2 years).
Good luck