Why do jobs keep turning me down?

I've always struggled getting jobs and I don't know why. I'm currently working as a part time cashier, have been for two years now. But I need a second job so I've stated filling online applications, place I've applied to ate urgently in need of people and some are other cashier positions. But I keep getting told I don't meet the qualifications for hire. How don't I meet the qualifications for hire when I've worked as a cashier for two almost three years now? Why do I keep getting told this?
9 mo
I'm not only applying to cashier positions as well but other positions and places and still keep getting told the same thing.
Why do jobs keep turning me down?
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