Do not be too hard on yourself. Take a look at yourself honestly. How can you say that you have not changed? It is impossible for you to have not changed. You are changing. You may be expecting a lot of drastic changes immediately – and that may not have happened. That may take a little while. So have patience. Patience and perseverance will make the difference, so do not give up.
There is a part in you that does not change – latch onto that. That is the true you. It does not change at all. Do not get confused with that part that keeps changing all the time.