Classic Gold Sequin Australia UGG

It was a gift. Looks New. It’s in excellent condition. Will not come with original box. Classic Gold Sequin Australia UGG. Has Pure wool lining. The label says that it’s size 37. I believe it’s European size because I’m a US size 7/7.5 but it doesn’t fit me. I think it runs a size smaller than what it is labelled so it would probably best fit a US size 6. I looked up the sizes chart and Euro size 37 is US size 6 but on here it only have the option size 7 (Euro 37)