In fact, everything changes. That is science and reality. The universe is expanding endlessly without limits. There is not something essential or permanent in us that does not change.
Nevertheless, the bottom line is that we need a sense of uniqueness individually, embracing tensions and changes in our human life. Be who you are! "I am that I am." No one can speak for you. Yet, you are not permanent. Embrace changes necessary to your life. There are many changes that we have to study and make them part of our life. We don't know all of them. But remember that without a proper understanding of change or living through it, our living will continue to be baseless or futile.