Showing up for your shifts is what is important. You can not work every time someone asks you to. If you are concerned about what your Boss thinks... ask your boss. You are going to make yourself sick constantly being worried about your job, this isn't a career for you, this is a "job" do your best, show up when you are scheduled work and be pleasant.
Hope things get easier for you
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Helping others gets me out of my own head ~
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