What does it feels like to get a chance to save a life?

This is what I was told:
I'm adoped (my real mother died shortly after giving birth and I don't know my father) and when I was only 16 months old, I needed a blood transfusion. The issue was that it's a rare type. Some guy I'll never meet had it, he traveled from far to donate it and I'm alive because of him.

Major reason to be thankful on this day and everyday:
Now I'm 29 years old, engaged and pregnant for the first time. I don't know who that man was and more than likely I'll never see him again. I wish I could say hi to him and thank him. Perhaps I might one day get a chance to save someone else with my rare blood type. From time to time I've wondered what that must feel like, to get a chance to save someone's life and you're the reason the person is alive?
What does it feels like to get a chance to save a life?
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