A crown is a pitiless master, harsher than the staff of a pig-keeper; while a staff bears up, a crown weighs down, beyond the strength of any man to wear it lightly.
Most of us are called on to perform tasks far beyond what we can do. Our capabilities seldom match our aspirations, and we are often woefully unprepared. To this extent, we are all Assistant Pig-Keepers at heart.
And thus did an Assistant Pig-Keeper become High King of Prydain.
No matter what has happened, you're not a pig-boy; you're an Assistant Pig Keeper!