Final answer:
In Spanish, the subject pronoun used to talk about yourself is 'yo'.
Step-by-step explanation:
The subject pronoun that you would use to talk about yourself in Spanish is yo. In the given statement "soy de Los Angeles, no de San Francisco", the subject pronoun "yo" is implied, as it is common to drop the subject pronoun in Spanish when it is clear from the context. Here's an example: "Yo tengo veinte años" (I am twenty years old).
Learn more about Spanish subject pronouns