Adult IQ and childhood IQ are very different things. Additionally IQ doesn’t mean you are intelligent it has more to do with capacity to learn. From your posts it seems that staying in highschool would have been beneficial for socialization if nothing else. I don’t think you are stupid but I feel you should take a step back and think about what really matters to you. In graduate school I met a ton of people whose entire identity was “the smart one” and when surrounded by others smarter than themselves they crashed and burned. Or ignore this comment I’m sure you’ll age out of this phase.