Unless you straight-up do NOT: own a home, rent, buy anything, go to school, etc. you will have some kind of available public record.
Yes, it's true that many people go beyond this with what they make available on social media and that's a definite issue. When people start "combining" excess social media posts, with "outside" known data...that's when you've got an issue. This usually results in people being able to EASILY dox someone due to the social side of things giving out information that is normally "protected"(think maiden name, previous locations, relationships, dob/location, etc.), all of which can be leveraged with public information to nearly total dox someone.
At the end of the day, we're in a new "age", where people will have to learn to protect their internet identity, as well as their "personal".