I find the opening post to be extremely ironic, to be perfectly honest. At any rate, I think it's pretty dumb to worry about how intelligent you are. It's a pretty pretentious and self absorbed thing to worry about. How would you even measure your intelligence in a coherent and comprehensive way? By taking an IQ test? By looking at your qualifications? Even if I did have an out right answer to the topic, I wouldn't have anything to compare it to. There is no one way track to level of intelligence. Look at Freud, he speaks about moral development and how it will relate to what someone learns, and moral development is different from every person, meaning that every person has a different form of intelligence. Some perhaps have the ability to argue well, some might know a lot about mathematics and another might be extremely good at art and know quite a lot about the field. I use the final example, because some say that there is a difference between how people approach math, and how they approach art. This may be true to an extent, but you need to learn a hell of a lot of theory to be good at art. This theory is not learned by the same part of your brain which creates the pretty pictures.
What I'm saying is, there isn't a way to measure anyone's intelligence. Obviously some people have problems which restrains them from learning as much as the average person, I'm not under any illusion that we're all equals. But the fact of the matter is, where Hawking excelled in science, Picasso excelled in art, there is no valid argument to state that one might have been smarter than the other (the gap in time taken into account).
I don't think I'm an idiot, but when it comes to certain areas, I am. But I have talents and know a lot about certain things, meaning I'm probably intelligent in those. So, in all honesty, it depends on the subject. I could be the simplest person you've met, or I could seem insightful. Unless I was on the internet, in which case, it's quite easy to feign intelligence.