I hope this helps, since you don't seem to be familiar with the word. Here is the definition for "shrive", the verb form:
VERB: Inflected forms: shrove ( shrv) or shrived, shriv·en ( shrvn) or shrived, shriv·ing, shrives
TRANSITIVE VERB: 1. To hear the confession of and give absolution to (a penitent). 2. To obtain absolution for (oneself) by confessing and doing penance.
INTRANSITIVE VERB: Archaic 1. To make or go to confession. 2. To hear confessions.
ETYMOLOGY: Middle English schriven, from Old English scrfan, from Latin scrbere, to write. See skrbh- in Appendix I.
Let me rephrase my original statement:
"I really hate it when I have occasion where I must shrove!"
Thanks, Linda, for the definition!