would you announce if it's your birthday today?

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if today is your birthday and nobody knows, would you announce it? or if it's your birthday today, how would you feel if no one even greets you?; no one even makes you feel special, no one even plans a surprise for you? what do you think then? what would be your reason of not making people know it's your special day? or what could be a good reason why we want to feel special on our birthday? ...just on a wondering mode... :)