i have social anxiety and today while paying for my groceries, i gave the wrong amount of money to the cashier multiple times in a row.
i apologized profusely. probably enough to make myself seem even more awkward than i already seemed. ugh, i need to stop thinking about it.
if it makes you feel any better, i bet that happens a lot to the cashier. they probably did not think twice or care as long as you were not a jerk.