You have lots of identities. And you can have an identity, you don't like it, because it's subverted in some way, or it's insecure, or it's inappropriate, you just delete it and get another one.
Se tiene cantidades, se experimenta con diferentes — Ud. puede tener una identidad, y no le gustó porque se la violaron de alguna manera, o es insegura o inapropiada, la borra y se hace a otra.