This was originally a reply to another post, but people asked me to write it as it’s own post so why not.
Amethyst’s character development has happened on screen apparently this need clarification since early season 1.
In the episode “Tiger Millionaire”, season 1 is when we are first introduced to Amethyst’s inferiority complex. We learn she doens’t feel appreciated by the gems and uses wrestling to feel better about herself.
In the end, the gems let her wrestle, recognizing how pressured Amethyst felt.
The next important episode in Amethyst’s development is “On the Run”, season 1. We learn how she was made in the Kindergarten and how she sees herself as bad because of it.
She thinks Pearl sees her as “a mistake” and the episode ends when Pearl reassures her that she think Ame’s good and the two reconcile.
I Lost My Heart in Republic City 