Islam is for everyone. So becoming a Muslim doesn’t mean that you will never be like the way you were before your conversion. You will have a “new” intention in life. The parts that enhance you to live peacefully will go, you’ll both be the same and be totally different.
You can still have the personality you used to have, with a “new”, intention. Your identity will be the same; you just need to add them a new perspective. By the concept of “new” we mean renewing your purpose of life because we believe that the truth is one.