Have I earned four years of college credit before 2018?

I graduated in May 2018. I have never taken the American Opportunity Tax Credit because my parents have always claimed me, but this year I am filing independently. I am currently in a graduate program, and I was told by my school that on the 1099-T, they always add the entire tuition bill to the year prior, meaning that spring of 2018 was put onto the 1099-T for 2017. Should I say that I HAVE earned 4 years of college credit before 2018 or I HAVEN'T earned four years of college credit before 2018? I think that depends on whether or not I get that AOTC credit.