Hi,
why would you even want to be called " Doctor" ???
That word doesn't neccessarily have anything positive attached to it, whereas "Physiotherapist" often does. It also indicates that we provide holistic therapy, rather than a quick fix (well, I know, that's a bit like wishful thinking ...).
If you are worried about knowledge of the general public, maybe you should invest more into promotion of our profession.
If you are worried about not bearing an academic title: well, a BSc or even MSc is just exactly what it stands for, nothing else. If you aren't happy with it, as above, do a PhD/enroll in a doctorate programme and write your dissertation. Good luck, because that's really a lot of hard work.
And please don't forget, there is still heaps of countries, where you need a prescription from a doctor to visit a Physiotherapist. And not all degrees are the same.
Cheers,
Fyzzio