Hi OP,
Yes, I get exactly where you're coming from.
I'm American and attended a "gifted and talented" school when I was a kid which meant I spent half days going off site to a school, separate from my daily one, to accommodate my high aptitude in certain subjects that public school couldn't focus on for me, specifically. I was extremely gifted at math, science and reading comprehension etc.
My IQ is 145 and, as a female, that puts me in a very rare percentile.
So, like you, I was kind of propped up with a lot of comments from others about how successful I would be in university, my career etc.
Well, once I left school, there was no one at all to help me. It's like I helped the school achieve their status and was abandoned! I wasn't given any career advice or guidance at all. On top of that, being highly intelligent made me a misfit amongst my peers and I had no idea how to navigate that as I got older. As a kid, no big deal, because I could focus on academics and didn't have time to worry about socializing. As an adult, outside of academics, I had all the time in the world and none of the skill
Fast forward to now, and I am not a CEO. I don't own tech corps. I don't have mansions or direct space centers. I'm just a wife, mother and own a side hustle.
So, yes, I feel disappointed that things didn't happen the way I was led to believe they would happen. I feel disappointed that it's taken me a whole lifetime to be able to have a discussion that other people can relate to and that doesn't involve complex pattern recognition as a fascinating subject over wine..ha.
People who drank, partied, didn't focus at school etc (and in many cases, are just downright mean) are much more successful than I could ever hope to be and at much earlier stages in their life.
So, you just never know how these things are going to end up and I guess we have to be grateful for what we do have instead of what we thought we should have had. That's helped me a lot when I get a bit sorry for myself.
All that to say, I get you!!!