Final answer:
The subject pronoun used to talk about yourself in Spanish is 'yo'.
Step-by-step explanation:
The subject pronoun that you would use to talk about yourself in Spanish is yo. In the given sentence, you would use yo to indicate that you are from Los Ángeles, not San Francisco. Subject pronouns in Spanish change depending on the person, and yo is used when referring to oneself as the subject of a sentence.
Learn more about Subject pronouns in Spanish