All careers are filled with routine tasks. If you are interested by the human body, you will be interested in physical therapy. If you are not right now, you may very well get interested as time goes on. I would try an shake off your doubts as best you can and give physical therapy school a fair shot before you call it quits. If you hate it though and absolutely can't do it, it would be better to bail sooner rather than later before you pay too much tuition. But you really ought to give it a try, learn to appreciate the miraculous beauty of biology and of the human body, and see if you do develop an interest or even a passion.
Right now at this very moment though, you should try to get some sleep. 🙂