Authentic balmain unicorn sneakers sz 9male sz10 female

Balmain authentic bought for myself. Unfortunately sz 39 euro doesn’t seem to be accurate. It is 26 cm which should be sz 10 female and 9 male sz I have sz 7.5 female and it is very uncomfy too big . It is heavy weight 7 cm heel almost 3 inches paid $1259 worn only one time