Patience, I crossdressed a lot before I realized I was a crossdresser.
More specifically, when I was a teen I crossdressed, but I was "just putting on a bra or a leotard". I WAS NOT A CROSSDRESSER!!!
Then I moved into my own place, and didn't have access to bras. So I didn't crossdress. BECAUSE I WAS NOT A CROSSDRESSER!!!
But I didn't lose the urge to put on a bra. It was always there. Because I was actually a crossdresser!