Thanks for clarifying. The reason I asked is because you talk about 'gifted' people with high IQs and that you are not one of them.

The word 'gifted' is used like: "She is such a gifted pianist, I was moved to tears!"
The term 'Gifted' is referring to kids that attended a Gifted Program where you need an IQ score of a certain number to get in or teacher recommendation.

There is no such thing as gifted people. So you must mean smart people. And these gifted/smart people you were talking to, where you then thought of yourself as an imposter-- who were they? How do you know they are smart? And what makes you think they all have high IQs? All smart people don't necessarily have high IQs.

What makes you think they are the same as each other and you are different?

So, it sounds like your thinking stems from an insecure lack of confidence. Everyone who comments on your posts tells you what an intelligent, good writer you are. Why do you doubt yourself?

I would strongly advise you NOT to take an IQ test. Don't give yourself any more ammunition. I consider myself a smart person, and if my test came back with low results, I would start to feel insecure. There's no reason to take one.

Are you in college? Do you have a good career? What have you tried to do?

I would still talk to a therapist about these intrusive thoughts and try to curb them.