I’m assuming the OP is on the young side. I’m 47. Let me give a chronicle of what a Friday might have been like in high school in 1990, to give some contrast.
Wake up when the alarm went off. Shower, shave, get dressed. Eat breakfast, maybe watch TV for a few minutes if I had time. Friends were scheduled to pick me up around 7:35 for ride to school. That meant that they might be there anywhere between 7:30 and 7:45 in practice. Get in car, listen to tape of NWA on 10 minute ride to school. Get to school, go to class. In free period or lunch, maybe read the newspaper. Chat with friends face to face. See what might be happening that night- rumors of parties, kegs, etc… Go back to class. Get out of school/athletics around 5-5:30. Dad picks me up on his way home. Chat with dad/listen to talk radio on 10 minute ride home.
Once at home, watch news/read newspaper to see what’s going on in the world. Call friends using land-line telephone and try to finalize plans if nothing had solidified during the school day. Come up with something- agree to pick up friends or be picked up. Take car/wait on friends. Go do whatever the plan was. A lot of the time, the plan falls apart, so you end up roaming around and/or hanging out with other teenagers at their house, or a handful of places where we could hang out without harassment. Be home by some time agreed-upon with parents. Go to bed.
This whole FOMO thing is kind of perplexing in that light; it was just part of the landscape back then- there wasn’t any real ability to adjust on the fly, because there wasn’t any way to communicate once you were no longer at home. So you tended to gather together, and then do stuff in groups, but a lot of the time, the being together WAS the event- hence the term “hanging out”. That’s also why being popular was more important- being popular meant that you had a wider social network and/or were more highly esteemed, so you actually heard a larger sample of the events that were going on, and had a better chance of doing fun/cool stuff than if you were a dork nobody talked to. It’s also why cars and drivers’ licenses were so important- you had to have them to do that initial gathering-up phase of socialization, or else you were stuck at home with your parents and siblings.
All that said, I think changes have slowed in some areas, and sped up dramatically in others, and the primary driver seems to be consumer technological change.
Pop culture seems to have stagnated somewhat, especially music. Back in my day(!) in the 1980s and 1990s, stuff from the 60s and early 70s was “oldies”. Now you may hear songs that are 10-15 years old on pop radio without any kind of “throwback Thursday” type stuff. You definitely did NOT get disco on pop radio when I was in high school, and it was only 10 years prior.
Culturally, things are wildly different, mostly due to a combination of smartphones and/or ubiquitous internet access. I mean, everyone’s got a phone on them that contains a tiny computer that’s more powerful than anything in the consumer world during the Cold War, and it’s all linked to the Internet 24/7. And it’s got location accuracy within about 30 feet, and a VERY high quality still and video camera. That’s game-changing. Just casual photography has changed recognizably since the Cold War. Not only do you not have to have a camera on you, you don’t have to deal with film, developing, printing, etc… And you can share them immediately- your family can see you at the Eiffel Tower RIGHT when you’re there. They don’t have to wait 2-3 weeks after you’re back for you to get your pictures developed and show the photo album or slide show. You can just send a selfie at that very second.
Same for traveling- getting lost/navigation isn’t nearly the issue that it used to be with GPS and Google Maps. Nor is finding places to eat, shop, etc… in places you’ve never been before. Or even in your own city for that matter.
Communication via text messages, emails and video chats like FaceTime, Zoom, etc… have changed how we interact in a lot of ways versus the Cold War era.