My name is also Katherine and I do go by the full Katherine.
Growing up, my family decided to give me the nickname "Kathy". Kathy reminds me of 40 year old spinsters with a lot of cats. I have never met anyone of my peers named Kathy, just people who have spinster aunts named Kathy, whose lives suck.
So, after trying out a few other nicknames: Kat, Kate, Kay, Rin, even Kathy Leigh (even though my middle name is Anne), I decided to just go with Katherine. It's easier, the name is already on my driver's license and it sounds nice. Not to mention lots of famous Katherines/Catherines.
I never tried "Katie" as I knew several Katies growing and they were all bitches.
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