ariana miyamoto says it was often punishing on some of the horrific racial abuse .
the first ever mixed race miss japan has lifted the lid on some of the horrific racial abuse she has faced on her way to the top .
the 20-year-old was born and raised in japan , speaks fluent japanese , and was last month .
critics of ariana 's win have complained she is a mixed race ` hafu ' and not japanese enough that