Which is fine, if the patient is not seeking to figure him or herself out. But if he or she were, there's no doubt your therapist would be helping him or her to do so.
Self-definition at any one point in time does not box anyone in. It can, instead, provide a clear understanding and a foundation for future change or growth, even if a part of the self-label is "I don't know yet".
I dunno ... there are just so many people here who seem reluctant to be clear about who they are and what they want. From my viewpoint, it looks like fear. But, fear of what?
Here is another definition for everyone:
pomosexual (from Wikipedia): a person who avoids sexual orientation labels such as heterosexual or homosexual.
pomogender (extrapolated from the above): a person who avoids gender labels such as male, female, or anything else in between.
Lol. Then the accumulation of scientific knowledge, which is communicated by providing definitions and explanations, is an attempt to control what? The advancement of human knowledge?