There's that joke about wearing regular clothes on Halloween to go as the "gifted kid", and when people ask what you're supposed to be you sigh and say you were supposed to be a lot of things.
You're gifted enough to cruise through the first few stages of your education without trying, so you forge an identity as "the smart kid" but never build up skills in learning or studying, so when you finally get to a level where your natural intelligence can't carry you anymore you can't keep up with the people who did learn those skills and you start to fail and lose your identity as the smart kid which causes you to break down because that'd how you defined yourself for so long..... or so I've heard.
I feel like you watched me grow up. For a long time I was smart enough to pick things up naturally, I was even offered to skip grades.
Then the math got complicated and I didn't know how to learn it. I went from being the smart kid to being the stupid one in remedial math. Being smart was all I had at that point, so when I "lost" that, I lost everything in my eyes. I was stupid and I was never going to be anything because of it.
I ended up getting my GED as an adult and I now have a promising career in insurance- so I didn't really lose everything, but when I was 15 it sure felt like I had.
Fun fact: programs for gifted kids have historically been far more underfunded than programs for other exceptional students.
By the way, the euphemism of "exceptional children" pleases my autistic brain way more than any other word for Special Education students. It has all the compliment-sounding qualities of "Special Needs" but is even more literal than any previous euphemism. It literally means "kids that teachers need to make exceptions for"