I have known a fair number of very intelligent, very educated people. I've never noticed that any of them possess the ego or the insecurity you've displayed here.
The truth is that you know nothing about me. So let me tell you a little bit. I was raised by parents who were extreme narcissists. When my giftedness was discovered in my childhood they became obsessed with it. They tried to push me mercilessly by placing extremely unreasonable demands on me, and constantly punished me when I did not live up to them. Their hope was that I would be a real life Doogie Howser, and that they could ride my coat tails to notoriety. When I was 7 years old I was a poor speller. Thinking that they would "set me straight" my parents once decided to withhold me from school one Friday and force me to remember all my spelling words correctly, to ensure a 100% grade on my weekly test. They spent all day drilling me on my spelling list, and severely beat me for every wrong answer. When I went back to school on Monday school officials questioned me about my many visible wounds, and then my parents as well. A couple days later I was withdrawn from school and within weeks we moved out of state. My parents realized they had to learn new tactics and spent the rest of my upbringing subjecting me to substantial mental abuse and torture.
A year later, as I was entering the third grade, I had learned that the best way to resist my parents was to rebel against my abilities. Mainly, I felt like all the hype that they kept feeding me as ridiculous, because I thought that the only things I was "good" at were things that were ridiculously easy. I couldn't understand how any of it could be said to be difficult. My parents pressed the school based on the fact that my end of year assessment tests showed I was on at least a 5th grade level in every area other than my primary weakness of spelling. But by this point I had learned that the most effective way to counteract my parents' crushing demands of me was to reject any effort to be smart. So the school puzzled over the fact that I was getting very poor grades and when questioned I constantly said that I didn't understand the material. So the school though I might be autistic. That's when they brought in the shrink to have me evaluated. I have to admit he was good. I didn't really realize at the time why I was spending so much time away from class with this guy, or that he was sizing me up. As part of the process I was given an IQ test for the first time. My gig was up. He confronted me about my act, and I tepidly admitted what I had been doing, with a lukewarm explanation as to why. He recommended that I not be skipped ahead out of concern that it would have an overall negative impact on me. To this day, I'm honestly not sure whether or not that was the better decision. On one hand feeding into my parents' ego would have made my life more of a living hell. On the other, the lack of adequate cognitive stimulation was a nightmare of its own.
The following year my parents tried to press the school again to skip me ahead by at least one year, but again to no avail thanks to my continued resistance. My fourth grade teacher, to this day, was an important influence in my life. She constantly challenged my attitude and refused to buy my act (which, of course, had now been documented by the school system as a farce), but did so productively. Unfortunately, she also ended up under investigation briefly, after my year end assessment test results were "too good to be true." By this point, I was testing on a 7th grade level in almost every category, and nearly on a high school level in sciences.
By the time I was 10 my parents' favorite form of mental torture was to harass me about my giftedness, and to throw my IQ test in my face. That's right, what ought to have been compliments were used as indictments against me. I wanted nothing more than to be "normal" because I was sick and tired of being the bad guy and for having the burden of my parents' own irrational need to have their ego stroked. This continued for pretty much the rest of my life, until I finally had the opportunity to leave the house and put them in my past. As time passed I had to come to terms with my irrational guilt over my giftedness. I tried to attribute it to wanting to be modest, but the truth is that I had become pretty self destructive, to the point where I had become extremely adverse to achieving success in almost anything. Eventually, I had to make peace with my giftedness, and in doing so take my life back for myself.
So if you find my confidence to be offensive to you, you're just going to have to suck it up and deal with it. This is my life, and I live it for myself. I know that we live in a world where everyone gets a participation ribbon and there are no winners or losers. But I've long since abandoned the practice of dumbing myself down for anyone else's ego. And I don't owe it to you or anyone else to do any differently.