What's it like to have an IQ of 140 to 170? Do people notice you're different?

That is because if your way of doing things is too different from theirs, and they cannot quite grasp why you do things the way you do them, then they will invariably conclude that you’re stupid for doing things the way you do.

At 140 you still have a chance to find enough peers that can relate to your way of seeing and doing things, it’s just a little more than 2 standard deviations above the mean, but go three, and it’s exceedingly rare for someone in the crowd to just get you, so instead you need to learn how to integrate - and many people do that quite well, but if they don’t, then they tend to stand out like a sore thumb.

Yes, people notice you’re different unless you actively try to hide it, and are actually good at hiding it.

13 million years ago, this object released as much energy as a billion suns in a fraction of a second! - Farmingdale Observer

Conversely, you may also feel that way about virtually everyone around you, and it might make you cringe, a lot. Unless you are exceptionally good at hiding your emotions, people will pick up on it and it will weird them out in turn, even make them take a defensive stance with you.

People won’t always conclude that you are indeed smarter than them though, often times they will instead think you’re weird and possibly a bit stupid.