How to cope with deep sadness

Assalamu alaikum everyone. I need some advice. I’ve been struggling with sadness since I was little, even back in primary school. It’s mostly because of how my parents treat me-they’re really unfair, especially because I’m a girl. My mom in particular knows how much she’s hurt me, and when I try to talk about it, she just laughs. It’s so painful. I don’t know what to do. Alhamdulillah, I would never harm myself; my faith keeps me grounded, and I can’t imagine causing my old father such grief, or how it would affect my younger siblings. I just wish they’d see my worth and treat me kindly. I know I might seem fine on the outside: I have friends, decent grades, a steady job. But inside, I’m exhausted. Since I was 9, I never pictured a future. I’m amazed I’ve come this far. Some might say move out, but I’m not legally old enough here. My extended family thinks poorly of me because my parents paint me as the villain. It’s partly my fault too-my anxiety makes calls awkward, and I’m not fluent in our family’s language, so I freeze up. Every Eid, I dread the gatherings afterward; I’m always the odd one out, babysitting the kids and feeling pitiful and alone. Please, any advice? Jazakallah khair.