If you were G&T as a child, you probably aren't "average" now, even if you haven't managed to be a rock star, prime minister or go to the moon. You probably are a good deal smarter than the average bear. I'm only average with maths and spatial awareness but I'm super with anything word-related, have a fantastic vocabulary and memory, and am great at analysis and spotting connections- which are the building blocks of intelligence.
Also very bright children often don't get the support and type of education they need, or certainly didn't when I was younger. Really from the upper years of primary school through GCSEs I was just coasting. Then I suddenly found that I had to do work for A-Levels, and more so for my degree. Some crash and burn when they find things hard. Lots of info on here.
www.potentialplusuk.org/index.php/introducing-potential-plus-uk/
DD1 is an absolute star, intelligent, high performer all round academically and also sporty, also kind, responsible, sociable, pretty and fit and an amazing dancer. She also suffers from anxiety from time to time, more so when she was younger, and is almost certainly a highly sensitive person which is a mixed blessing. You never need to push he as she challenges herself.
DD2 is in some ways a total opposite, like Type A and Type B personalities. She even has blonde, fine, curly hair while DD1 has thick straight dark hair. DD1 is petite for her age and DD2 is a beanpole. I see them both as gifted in different ways- DD2 is probably only around average academically, but takes homework in her stride, whereas DD1 would get upset about it at primary school as she wanted to get everything right, and it was very much all or nothing, whereas DD2 just gets on with it, which is a great skill in life. Also she has the gift of the gab, and makes people fall about laughing, and other kids are just drawn to her, everyone wants to be her friend. She is a fantastic sports woman.
I don't think they have a Gifted and Talented register now, DD1 was certainly on it, but DD2 probably wouldn't be.
Anyway, the point is, apart from me enjoying a jolly good boast about my lovely daughters, is that there probably will be something your kids are pretty good at and can certainly develop into being really very good indeed at with a lot of hard work. Our job as parents, among other things is to find how to best encourage and develop them into well-rounded and resilient adults.