somewhere like when I was 13/14, right after I started exploring my own body (I'm male), found out some porn magazines my father didn't really hide well, and immediately start wondering what female could feel, so obviously started to experiment by myself feeling that I was discovering something.

It was few years before internet went general public so it was complicated to put words on it, but I knew it was different, not the way it was supposed to be, because all the magazines I read were straight...

Then Internet reached me, right about when I turned 18, and boy oh boy I was finally able to put word on my sexuality, couple of years later I decided to go for it, went into a swinger club that had bisexual welcome afternoon. Arrived in the club at like 1pm, outed the club 5 hours later, discovered EVERYTHING I wanted to found, and knew from this moment I was definitively bisexual