Wow, I had no idea such feelings were so common. I've largely felt like this for the last couple years, as I've gone from "that weird kid that does something with computers" to "startup founder" (and now back in a real job again, which has been an odd (and refreshing) adjustment, but that's a subject for a post of its own). While I can recognize that I'm doing cool things, I just don't feel like it's that big a deal; when someone acts like something is actually a big deal, I feel like I'm overselling it. Hard to explain, but it's nice to see that I'm not the only one in the community that feels this way.