Your personality is an image accepted by you. This image has been built during your life from very early childhood. It was built by your parents, your teachers, books and magazines you read, your friends, brothers, and sisters.  They told you what you look like and what your character is. They told you what you must or must not do. You made your choices, accepted specific roles in different situations, and learned the results. Over time, you put these behavioural components and roles together in the kit of ideas about yourself - your personality. 
As you have accepted this image so you can transform it. If this image is not comfortable – take another one. It is easy. There are no barriers.