Kim, thank you for reading and taking the time to respond.
You're absolutely right, I do consider myself somewhere in the middle, which was part of the motivator for writing this.
You mention that people can still develop social skills and be an introvert. Yeah they can exhibit extrovert behaviour on the outside, but inside they're truly an introvert. My point is, why bother with the labels? They just seem unnecessary in my view.
Again, thank you for reading and taking the time to conduct an in depth response.