For Me it was a big "miss out" on _anything_ social. It was a big miss out on sex Ed learning, communication and friends. By jr and senior highs, what few friends (geeky nerds) was only met at school for the most part except for Maybe an every other week meeting for tabletop gaming night. I spent grade school playing with girls at recess (too scrawny to play sports with boys). So jr high hit and these girl "friends" now we're separated from me so I basically was a loner the rest of school. (Girls now starting to look at guys in other ways, and me being still too scrawny to get along with any other ontheguys side.
And sex.. The great mystery (at least for me). Sex Ed was just showing girls have these parts, guys have these parts.. Put them together and you'll get a baby. Not really "how" the parts worked together. My biggest sex Ed was from a classmate.. Big hulking Latino kid (compared to me). He taught me "ya put yer dick in the girl and piss! That's how babies were made! "(Heh)
And I had thought mom didn't give me a birds and bees speech. Well. I found out 4 weeks ago she had tried in her own way. She found a highly technical magazine article in Lady's Circle of how to explain it to kids based on 1969-1970 info. She did what then '70's was an equivalent of make a copy.. But this was 2 full pages of typed out text.
She handed that to me supposedly stating "any questions, ask". (She kept that typeup..I saw it last time I visited..heck even have picture copies of that. )
Hell, I was a kid. That's a lot to just plain read...if I did (don't remember it). She said I didn't ask anything.. (Of course..I ignored the wall of words...).
That was my sex Ed. When I eventually did do date and my only sex attempt..age 18... I had no clue on really doing anything to stimulate, how exactly to physically do it I didn't even know you were to be hard going in and movement,etc to stimulate. (There was no real penetration and nothing really accomplished). Even if I had truly read that article.. It just said things like "stimulate then you will ejaculate" all technical like. Nothing about the stim part meaning or what you and the partner would do to achieve this stimulation.
That's how sex-knowledge brain-dead I was. Wasn't until my 20's when I finally figured out what it all was really supposed to have been (thanks, early Internet).
Back to high school.. Senior year I apparently did have a few girls commenting on me in band.. But I was too socially (and sexually) inept to realize what they were talking about.
And I do know about cliques.. between cliques, and negative-level popularity..I figure that's why there had been zero attempts for the school to contact me for any school reunions. It's now been 31 years..they should have had a big 30 year one not long ago.
Granted...now with my transgender MtF transitioning, it'd be a keckuvva story there now
So missing out? A lot. And still affects me today (severe social anxieties from it). Oh, nowadays I get out occasionally to clubs. But I'm still just a wallflower there. I've been heavy pro open-sexuality and LGBT inclusive online, on Facebook, and discussing with friends. Well-studied erotica-wise. Even to investigating and appreciating the kinkier sides thru fetlife, alt.com and such. But none of that actually has resulted in anything physical due to social handicaps. And now, since this will be my year 50 in July, and I'm transitioning..it likely won't ever change.