You're still confusing sex and gender. Allowq me to repeat what you said but using the correct terms:If people are not content with their natural sex, current practice permits them to use any other description they like. Current practice calls this their gender.
"If people are not content with their gender which may, or may not, currently align with the sex they were assigned at birth, current practice permits them to adopt a different gender, one they prefer. Current practice defines this as their gender."
What do you think gender reassignment is? (Also known as gender affirming, gender confirmation, etc.)However it is not possible to change your sex, which is determined genetically and expressed anatomically.
Gender reassignment surgery is used to help the person concerned to resolve this disconnect by permanently altering the body parts associated with their biological sex.
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Gender dysphoria is a term used to describe how an individual feels a strong sense of disassociation between their gender identity and biological sex.
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You can become a woman because 'man' and 'woman' are genders. Similarly a woman can become a man.... and I am not a woman, and it is impossible for me to become either, because I am a man.
However to become female, I am assuming you would need gender reassignment treatment.,