Aside from no friends, the rest of those things apply to a ton of 19 year olds. I don't think it's entirely Social Medias fault they have a weird expectation; even I had that as a teen and I heard my dad's generation did too.
I think it's mostly because people see movies where sex is commonplace in high school and losing your "V card" is a thing. The expectation to drive and work has also just been there since forever ago, but this current generation is even less likely to need to either. At least I know there are some non-chan places also pushing to get teens to understand those expectations aren't normal...