Feeling smaller or lesser than others in a dream reflects a comparison you may be making while awake. Dream books read it as an invitation to ask whose measure you are using.
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.