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How to stop being called a child
Examine other people's motivations.
When somebody calls you a child, think about why they said it. Is it your physical appearance? Did you do something that would cause them to say it? Knowing why people perceive you as a child can help you work on looking and acting more mature.
If you can't identify a reason, ask the person politely why they called you a child. Don't get angry with them.