Perhaps you've been able to see yourself more clearly after reading about specific emotional/perceptual obstacles. Perhaps you've always been so introspective. Perhaps you've merely produced a story about yourself that sounds convincing.

I've always thought about stuff a lot on a deliberate, analytical level. From a pretty young age, I remember being able to distance myself from my immediate circumstances and imagine "which part of the story" I was in now. (The tendency to fit my life into story format is one that's been with me all along, and is probably helpful in some ways and unhelpful in others.) I've always been able to put words to my emotions and describe the way they interact in detail–I think I've found that just the act of analyzing the way I feel allows me to step back far enough that negative emotions aren't painful anymore, just interesting. One of the most common topics of discussion between me and my sister is trying to analyze other people's actions, mostly people in her high school crowd, where social dynamics are exaggerated in terms drama and scope–I apply my knowledge of cognitive science and ev-psych, and it's one of my favourite conversation games.

That being said, my ability to tell a coherent, convincing story for my own actions doesn't mean that's what's really going on, underneath all my opaque brain circuitry. Introspection is imperfect. Just because it feels true to me doesn't mean it is.