I've had many conversations with many people my age (mid 30s) about how we went from "don't post anything about yourself" to "post your entire life online" around when Facebook got big, so I don't think it's something that only I experienced. There's another commenter on this post saying something similar and I remember being taught about "internet safety" in middle school, so maybe it's a generational thing.
I'm from the same cohort as you and can corroborate this. I definitely remember how strange it felt to me when social media became a thing and the taboo of attaching personally identifiable info to your web presence suddenly disappeared.
I've had many conversations with many people my age (mid 30s) about how we went from "don't post anything about yourself" to "post your entire life online" around when Facebook got big, so I don't think it's something that only I experienced. There's another commenter on this post saying something similar and I remember being taught about "internet safety" in middle school, so maybe it's a generational thing.