Early in my career, I prided myself on my ability to absorb a lot of information and stay up-to-date on programming tools and techniques. I learned C++ before any of my colleagues did, and knew more about its intricacies than they did. I implemented ActiveX control containers before most people knew what "ActiveX" or "COM" was. I dug into CORBA. I played around with Java 1.0.
In short, I liked being an expert on new stuff. I enjoyed being on the bleeding edge. I liked being able to answer everyone's questions.
Still, I'm nagged by the feeling that I'm behind, and won't ever be able to be one of the foremost experts or significant contributors to the communities. Maybe someday I'll be mature enough to accept that, but I'm not there yet.