Don't I have even more privacy in public space? Sure, people know what I look like, but not my name, my email, the contents of my backpack, since when I have be

Don't I have even more privacy in public space? Sure, people know what I look like, but not my name, my email, the contents of my backpack, since when I have been a member of this forum etc. . If they see me again the next day they might not even be sure that I am the same person (unlike unique usernames with history).