In various places around the world, the first menstruation of a girl marks their transition to womanhood. It typically lasts one week after the god of the moon shows his entire face, and ends when he begins to cover it with his mask. The goddess of the sun also plays a part in transition to womanhood because those assigned female at birth become aligned with the feminine energies of the dawn. Those who are not AFAB but desire to be female can affirm their gender through a simple ritual.
Take some red liquid such as wine, cranberry juice, or some animal blood from the store and put it into a small syringe or tincture. Bring it with you into the forest while wearing a white dress or some other garment representing innocence or femininity for you. It can also be any clothing that represents transition like travel clothes or hiking gear. Find a secluded spot with good energies and leave seven drops in front of you to represent the seven days of a menstrual cycle. When you leave the forest or natural area, you will feel pubescent again and for a time, you will feel bubbly and desire relationships like a high school girl.
Those who wish to be male but are not AMAB, can do a similar ritual. The logic behind this one is that the first time a male realizes they are growing up they tend to realize their own fertility, and are surprised by it the first time.
For this ritual, a white liquid (usually sticky) such as milk, egg whites, or glue is used to represent the life energy fluids of men. Take a tincture of this and take it into the forest while wearing masculine clothing or expressing masculinity in any way that resonates with you. In a positive secluded spot in the forest, throw the white fluid underhand but never let your hand reach above your pelvis for this. throw is as hard as possible to represent a burst of pent up life energy. After this ritual you are a dude and you will gain increased libido, possibility to gain muscles, and those who are attracted to males will pursue you.
These rites may seem distasteful or strange to those who are not pagan or who are shy about the topic, but nonetheless the rites are correct because traditionally the genders are about how a person reproduces. The social expectations and roles only come after that primitive function.