When explaining it to normal people, I used to play up how it was really a personal thing because it went against my nature to glorify myself and put myself at center stage for everyone to buy gifts for. All I did was not die for 12 months.
The truth was, I was programmed to detest birthdays since infancy. I can't find the original 1978 version of this picture, but I recall the decapitation being far more graphic:
Then I went to @stuckinarut2 and @Unstuck's combined birthday and realized... I WANT A BIRTHDAY!!! I'll still probably have a no-gifts policy or something next year when I do my first proper birthday (I can't shake that feeling of being undeserving from my WT upbringing). The company in itself will be more than joyous to experience :).