How to be happy?

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To be happy u must realise that everyone needs u no matter how young , old , rich or poor and they are. if u think of a time when u wer truely happy and feel how u felt at that time and what where the sounds and scenes at the time bring that to the present bring that feeling forward to now and u should feel instantly better. always believe in ur self and ur ability always. any one ne other techniques??? share them here??? or even experiences??