A book, or a movie or an event that affected my life!

Is there really such a thing as an event, movie or a book that could really change or affect somebody’s life? The answer will definetly be yes!
My story began five years ago from a simple blood test I had to do. Being a volleyball player like all the other athletes i had to carry with me a health ID card to every game. To publish that ID card I had to go through a series of tests to confirm that I was healthy, in which one was the blood testing.
I then discovered that my blood type was rhesus O negative and that was impossible since my parents were both rhesus A positive. I knew from my biology class th...