Even just the statement, "I changed my mind" seems to imply that the mind could not be self, if it can be changed like that.
But I think that to then focus on "I must have no self at all, then!" is to still miss the point, the point being (as this simple-minded person understands it) to see suffering, it's cause, it's cessation, and the path leading to it's cessation,
rather than to be obsessed with 'existence' or 'non-existence'.
Then the Blessed One, picking up a tiny bit of dust with the tip of his fingernail, said to the monk, "There isn't even this much form...feeling...
perception...fabrications...consciousness that is constant, lasting, eternal, not subject to change, that will stay just as it is as long as eternity."