“Why do people expect you to be energetic all the time even when you are tired or injured/have some pain just because you are young? Oh yes compare myself now to 7 year old me who was a small child and had no worry in the world and had no work to do.”
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Someone answered with kindness...
You don't have to be enegetic and happy for others. People see what they wants to not what you want so just be yourself. Be sad if you are be angry be happy. Be what you feel like.