This mind goes on continuing. This mind will go on continuing, unless you become aware. And this is a miracle: that the moment you become aware the continuity is broken. Now you will be, but not of the past. Now you will be of the moment - fresh, young, new. Now each moment you will die, and you will be reborn.
To regard one's immortality as an exchange of matter is as strange as predicting the future of a violin case once the expensive violin it held has broken and lost its worth.