The speaker may feel that her Spanish is not good enough due to a lack of confidence or negative experiences that have made her feel inadequate. She expresses frustration and determination to prove herself.
The speaker may feel that her Spanish isn't good enough because she lacks confidence in her language skills or because she has been made to feel inadequate in some way. It's possible that she has experienced negative comments or judgment from others about her Spanish-speaking abilities. In the poem, she expresses her frustration and determination to prove herself and show that she can still help people and connect with others despite any perceived limitations.