How would you feel if you were the "spare" kid?

purplepoppy
Harry, the half-price prince, has just released his book "spare". The title of course is a play on the saying "William's the heir, Harry's the spare".

Leaving aside his self-pitying whining, how would you feel if your parents told you they only had you as a back up?
How would you feel if you were the "spare" kid?
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