Somewhere between ages 3 and 5 for me -
By Halloween at age 5, i was literally consumed by an all-encompassing need to present myself to the world as a girl, and wanted nothing other than my beautiful pink chiffon Princess dress with a tiara, hair done, makeup, and pretty shoes - i knew in extreme detail what i needed and wanted more than anything else in the world, and had no way to get it.
This was the last time i ever spoke a word of it (i made some cryptic mention of it to my mom when she asked me what i wanted to be for halloween, which she didnt know how to respond to at that time) to another human being for almost 30 years thereafter.
My heart was literally breaking in a million pieces from the strength of that desire, even at that age - it was so all-consuming that i will never forget the feelings, even from that age. Even as far out as age 14-15, i was still hoping that somehow the proper changes would come, that my breasts would start growing, and that my genitalia would somehow become something else, other than what it was...
Sincerely,
ChefAnnagirl