I have also given this some thought. I came into the truth, so I do have a point of reference as to what I was before, during and after the truth. I don't know how born-ins answer the question of "who am I ?" How is it possible to know what your natural personality is - minus the childhood indoctrination.? Stuff in life has habit of "regressing to the mean" as in - the average. So there would be an average you there somewhere underneath all the layers of cult-think.
It can take some time and patience for it to emerge but I am confident it is possible to find a new normal.