Self-discovery is read as meeting a part of yourself you did not know was there. Dream tradition often shows it as a new room or a hidden door, and takes it as a stage of growth.
When this appeared in your dream, what were you feeling?
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.