A special skill you have

Since I was a child, I have always had the ability to change. Not my physic, not my ideas, but the way I act around people. This is commonly known as changing register. However, my skill goes way beyond that.

I usually like to compare it to water. You see, water has the capacity to change its form depending on where it is. Something similar happens to me, it's as if I was just a blank canvas and my personality changes to be liked. Sometimes this makes me wonder who I am.