Feeling defeated this internship season

I will be headed into my sixth year in the fall as an undergraduate studying BME after switching majors and life circumstances. I’ve completed two internships, which I am very proud of, but I was hoping to get a third under my belt. This year, I’ve applied to hundreds of positions, secured interviews with five companies, and I still haven’t received an offer this year. I just have no idea what I’m doing wrong here, but this fifth rejection I just got hurts.