For more corrections next time write in the notebook in English and not in Portuguese

A person is questioning their relationship to you. I can imagine a woman and man who have gone out a few times, and the woman wants to know where she stands. If he considers her a long term girlfriend, or is not serious she will say "Who am I to you!?" Implying, Am I your girlfriend/lover/ or what?

It depends on the context: 1. What do I mean to you 2. How are we related