Why can I get a job as cashier, or data entry position?

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Why can I get a job as cashier, or data entry position? I've obtained A.S. degree for awhile, and I didn't look for jobs because of alot of reasons that impact mylife. Now I feel like I'm ready and want to start somewhere. Therefore, I currently apply a job that is start out low, but still didn't get it. Why??? Is it because I'm over qualified or because I'm lacked of experience?