Hi Cici,
In English-speaking countries, someone introduces themselves in general situations by their type of work (or their subject or level of study if they are a student). So, I introduce myself: “Hi, I’m Irene. I’m an online tutor of English as a foreign language on a platform called iTalki.” Then I would ask my conversation partner, “What do you do?” or “What about you?”
In this general introduction to strangers, I would not mention my family or personal relationships. <em>If </em>the gathering is more personal or community-based and I know that the person I’m introducing myself to probably knows about me through a personal connection, <em>then </em>I would mention, “I’m Thomas’s sister/Alice’s daughter/Brenna’s friend.”