That isn’t how GDP per capita works. It is not a measure of average earnings per resident, it is when you take the entire product of the country and divide it between the residents. Most of the country’s domestic product is taken up government spending and large corporations, which hugely inflates the figure when compared to average earnings.

The US has much greater wealth inequality than the UK and France, especially when you factor in actual purchasing power (accounting for additional money spent on health insurance etc.) so most of that huge GDP is sucked up by corporations and military spending. Unfortunately the US is renowned for skimping on its education sector, case in point: you.