Why do you donate?
I am a universal donor. 6.7% of the population have my blood type (O-), but 100% of the population can use my blood. This is why I donate at least five times per year.
What is unique about your story?
Ironically, being a universal donor, if I ever need blood, it must be from another universal donor. With O- also being used in emergency situations where blood must be given immediately and blood type is unknown, it is frequently in short supply. This is another good reason why O-‘s should donate as much as possible.