BTM - good question. I had a huge crisis last week - I was asked to write a paper on a subject that I know very little about (fortunately neither does anyone else) and had a bit of a meltdown - I've been overpromoted, I can't do this, etc etc. My French teacher also said to me, rather crossly, that there is nothing wrong with my French - I am "presque bilingue", all I lack is confidence. I was pushed very hard at school by my mother, who taught me to read at 3, taught me French from the same age, Pythagoras at 6 etc etc. I was going to be the first in the family to go to university, she was determined.
I took my maths O level mock at 13, with a view to taking it 2 years early, and got 9% in the exam, whereupon I was put down a class (which is where I should have been in the first place; maths is not my forte). I had had enough of studying by this time, and basically stopped working. Had Ed Psych see me etc, but I had just had enough of learning. I coasted through my O levels, mediocre grades, and cocked up my A levels spectacularly ("What am I going to do now? I've told everyone you're going to university!"). I then drifted for a bit, while I dithered about what to do, and somehow managed to get on a graduate scheme (the only non-graduate to do so) - which my mother was delighted about, as it meant I could "pay back some of the money which had been spent out on me over the years." Unfortunately for her, she was charging me so much in rent that it was cheaper to move up to London and share a house, which is what I did. Two years later, I moved overseas, at the age of just 22, and have spent about 5 years in UK since then.
So, I don't think I saw myself as a high achiever, but my mother was determined that I was going to be, at all costs! A few years ago, I got accelerated promotion - so I must be doing something right, somewhere, I just don't always quite believe in myself. And the current job is, I admit, right out of my comfort zone - the focus of it being something I studied at school, and failed the A level in, twice. I still can't quite believe that I am not 18 any more, and have it firmly lodged in my head that I don't "get" this subject, although 30 years have passed since then, and I have since had quite a bit of training in this subject!
Gosh, that was long - does it answer the question?! 