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How to be less whiny
Ask what you want in a polite, normal voice.
If your parents or other adults hear whining, they may often shut down with a firm " no " or even ignore you. Try asking whatever you want in your normal voice and make sure you're polite about it.
You may find that this gets you much farther in your request than whining to the adult. Make sure to use your usual voice or even try a whisper if that helps you.