I don't think I knew any, not until uni when 3 of us shared a flat and one was a lesbian and then meet more on nights out with her and her friends etc.

In later life I know that at least two people from my school came out as gay and one as trans. And a friend at uni came out as trans years after.

My parents were never homophobic or transphobic overtly, my dad would make some comments that echoed popular humour at the time of making fun of stereotypes. My mother worked for an org that dealt with discrimination claims so she always had a better handle on things.

I do think i grew up with a certain level of homophobia and transphobia, not helped by shows like Little Britain... It was just in the culture but I like to think I've shed basically all of it bar some unwelcome somewhat intrusive dissonant thoughts these days.