Oh, don't get me wrong, I was a "gifted" kid too. Turning 30 this year. I was in advanced classes from around 4th or 5th grade when they started separating us (suburban Texas) and then went to a special high school where I graduated with an associates degree and my high school diploma. Not trying to brag, just to relate and say I've been there.
I wouldn't say I was a disappointment, but I certainly didn't go as far as even the "smart" kids from my own graduating class. I know many of them are "real" engineers working for companies we all know and doing important work in hardware, architecture, civil projects, and aerospace. I feel dumb compared to them.
At the same time, I have a successful career in software, no debt, happily married for almost 10 years, moved to a different continent, etc etc. Sure, am I "smarter" than the average Joe? I guess, but knowing that information doesn't change anything about my life. If I took a real IQ test, I think I would also feel some sort of disappointment or pressure to live up to expectations or better myself in some way.
Idk; I guess that's why I made my original comment. The utility of knowing your IQ is "above average" is so useless to me, I'm not sure why anyone would want to knowingly saddle themselves with that knowledge. Be free, be happy, and be yourself.