My entry point was via a RL friend who had weekly X-Files watching parties at her house for the first few seasons of the show. This was when we were in middle school. The same friend was very tech-savvy and introduced me to the internet and the fact that organized fandom existed there, including fic.

I'd actually been writing fanfiction for years by then, probably since I was seven or eight? But I had no idea I wasn't the only one. Bless that friend for opening my eyes. :)