Guilt is read as conscience speaking, a sense of having fallen short of your own standards. Tradition sees it less as punishment than as a pointer to something you would like to set right.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.