Absolutely not. Childhood as people think of it in certain places is a cultural construct. The amount of the world where childhood is a blissful and innocent time of frolicking and playing is by far the minority both now and historically. Anyone who thinks they "missed their childhood" because it doesn't have those characteristics is laboring under a delusion of the privileged. All over the world (including in America among poorer people) there are children who have to work the moment they become capable, have to raise the younger children in their families after their parents die or go away, and have to deal with so-called "adult" issues from the day they are born. Those of us who have the luxury to believe childhood should be about playing and a general lack of responsibility, should get a clue instead of complaining that we "lost our childhoods" because they didn't meet an ideal that few people's childhoods meet. It really makes me mad when people run around acting like they know what "childhood" or "adolescence" or "young adulthood" or "mature adulthood" or "old age" ought to be like, and then gripe about how they have "lost" such a thing because they're either disabled or a loved one is. Welcome to reality, you didn't lose your childhood, you just, like most of the rest of the world, didn't measure up to a ridiculous and sometimes even destructive (because people who meet the ideal do it on the backs of those who don't) ideal.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams