Argument for the soul from free will

Hello Miki, what's up? I have an argument for the existence of a soul that comes from free will.
A) I experience that I have free will, so I have free will.
B) There can be no free will if all I am is just matter, since matter is governed by the laws of physics.
C) So then, I am not just matter, but there is something in me that is not just matter (a soul).
Of course, the argument does not challenge free will, but I don't think it should be challenged because it is such a basic experience in us that it is much more likely than not to be true.
What do you think about that?