Yeah, it was weird. Most restaurants had a non-smoking section because allowing people to smoke everywhere was the norm. Leaded gasoline. Little kids playing with real fireworks. The 70s and 80s were a wild ride of irresponsibility.
It wasn't all bad, though. It was cool being a kid at times. Playing outside almost every day until dinner time with the other kids in the neighborhood.
People mature at different rates. There are myriad reasons for this. But it's OK to be a little bit immature for your age. There's no shame in it and it's very common. Being an adult mostly sucks, anyway. You're already aware of it, so that's a good thing. Pay attention to social cues and behaviors of your peers and you'll figure it out.