The Collaborative International Dictionary of English v.0.48:

Self-reproof \Self`-re*proof"\, n.
   The act of reproving one's self; censure of one's conduct by
   one's own judgment.
   [1913 Webster]

WordNet (r) 3.0 (2006):

self-reproof
    n 1: the act of blaming yourself [syn: self-reproach, self-
         reproof]