An R.A. is either a Resident or Residence Advisor or Assistant.  Shepherd called them residence assistants.

The people who try to keep order in the dorms, the noise down, keep harmony.  In Shepherd's case very emotionally and socially mature and often high awards (Rachael had McMurran Scholar, or the Shepherd equivalent of the Congressional Medal of Honor)
It probably does not surprise anyone she is employed there 15 years later.

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I don't feel like a monster but I am concerned that I was treated as one, even worried I might actually be one.

Did the other ogres think Shrek was a monster too?  I misunderstood my own dad.  He seemed so lacking in graces he could be mistaken for one, heartless.