‘Who are you?’ generally isn’t the easiest question to answer. But it is an important question.
After all, there are a lot of things that you are not, and so you would like to clarify that somehow. Your environment often insists on an answer as well. Sometimes directly, sometimes in subtle ways by conveying agreement and disagreement.
The advantage to identity is a certain clarity regarding who you think you are. Its disadvantage is that it can anchor you, which doesn’t work for everyone. In such cases it can be helpful to talk about fluidity to indicate that identity, too, is merely a changeable label. This provides leeway, but at times also ambiguity.