I need help

I don’t really know what to do, I am 19 and have been looking for a job for a long time. Every time I apply I either never get called back or emailed, or I go to the interview, look snazzy and be confident, but don’t get hired. I recently was referred to a job agency, so I set up an appointment with them. They did get me a job, however I was “laid off” or my assignment ended after just a week. That was about a month ago, I’ve been looking for another job since. What do I do? I’m stressed and I don’t know

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