Oh dear I disagree with this on every level. If you really had a low IQ would not be aware of it and so you would feel just fine.
There are geniuses of course but most people in pretty much the same and a few points on whatever IQ scale you are using makes no real difference.
Are you sure you're not using your anxieties about IQ to beat yourself up about something else?
Other than that your posts seem remarkably intelligent to me.