Be conceived and born into Trekkieness.
Some are born into Trekkieness. Some others achieve Trekkieness. Others still have Trekkieness thrust upon them.
For me, it was the will of the miditricorderians that conceived my trekkieness into existence. That, and watching Star Trek III many times.
: It's mindless now, clicking towards oblivion. ... How long, K-9?
: INSUFFICIENT DATA.
: Yeah, you never fucking know the answer when it's important.