By "tickling yourself and getting a reaction" I'm more so thinking about being able to tickle a certain spot and you involuntarily pull away, or it become uncomfortable quite quickly, or you can make yourself giggle. Nowhere on my body can I do this. I can get "almost" ticklish sensations if I rub my tongue on the top of my mouth, or lightly trace little circles on my big toes, or grab certain spots on my ribs.
Also, I would imagine that how much you can tickle yourself says a lot about how ticklish you actually are. It good to hear that not many people can actually tickle themselves because I was getting a little worried that I wasn't very ticklish, and that would really suck.