You really have talked yourself into an obsession about this. Could this be OCD?

Gifted people do not think others are beneath them. They are busy doing things and having ideas. The smartest people are the ones who ask questions.

Where did you even get this idea that you are not gifted and have a low IQ?

Some of the most successful people I know are just average people who push themselves.

We never stop learning. IQ measures your capacity to learn. You say you are reading and always trying to better yourself. You are always getting smarter!

I think it would help you to see a therapist about this obsessive thinking. It is not serving you.