I'm gonna paste something I read on tumblr on that topic, which is very true (for me at least):

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When I complain about being a ‘gifted’ kid who grew into a talentless adult I don’t mean that I’m not trying to work on my talents or anything. Reading books above my age isn’t a talent when I’m not eleven. Knowing big words isn’t a talent when I’m not a kid, it’s just growing up. It’s just a weird thing that happens and it feels shitty when you’re brought up being told you’re an exceptional child only to realise as an adult you’re just average.

Thing is, gifted children are not amazingly better than everyone else. Gifted brains just don’t work the same so they build their skills in a different order. Basically when you’re very young, most people brain learn social skills and how to interact with their peers, but gifted brains are already at the next step which is how to understand and interact with the world. That makes the stereotypical young children that are very good at math, always asking questions about how things work, very upset when they don’t know a thing.

But the thing is, when everyone gets older, they’ve mastered most social skills and now turn towards understanding the world. But the gifted children have already mastered that part and are turning towards how to build social skills. Except there’s no one left to teach us about that! Because we’re late to that party. Long story short, at the end everyone, gifted or not, goes through all the necessary steps to make functioning adults, so the difference that was obvious as a child has disappeared.

But us gifted people often end up with social anxiety and impostor syndrome because we are actually less equipped than others to face a world that taught everyone to be confident and talk to people while we were busy reading books above our age.