Final answer:
The significance lies in the expression of deep self-realization and transformation regarding one's identity and potential in the given sentences.
Step-by-step explanation:
The sentences "I've been something I didn't recognize, didn't know I could be. Didn't know anybody could do." are significant as they represent a profound moment of self-realization and change. Such statements often allude to a transformative experience that alters an individual's identity and understanding of their capabilities and potential. The character reflects on an estrangement from their known self and a venture into previously uncharted aspects of their identity. This can be seen in various literary contexts, where characters undergo pivotal development or confront aspects of themselves or their society that were previously unknown or unacknowledged.