Not every one. I crossdressed at an early age...around 4 or so....and I always knew I was a girl, even before I knew there was such a word as transsexual. Did I want to be a crossdresser? No! I wanted to be a girl. When asked why I crossdressed my response was..."it is the only way I can find to make me look like a girl".
How do you tell a ts girl apart from "just a cd"? You cannot, but many times they know. (I did)