Precisely - our freedom to think can't come from anything in the physically deterministic world of nature. I am responsible for my own thoughts, making whatever is "me" to be supernatural rather than natural (of nature).
That is just silly. If our thoughts were supernatural then they would not be limited by circumstance.
Try these thoughts out :
Think of something that you have forgotten.
Believe something that you don't believe.
Look up at the sky and see it as green.
Think of something before you thought it.
Think what is the result of 25 * 879 + (23 * 9382938923920 / 49) (don't cheat now)
If you have trouble with these then I don't buy it that you are supernatural; you are just as limited by reality as the rest of us.