I Found the One, but My Parents Say No Because of Our Customs

Salam everyone. I need to get something off my chest and maybe hear from anyone who’s been through this. I’m a practicing Muslim, and about two years back I met a sister who I truly care for-she’s on deen, we share the same values, and I honestly wanted to move toward marriage with her. But I never took real steps because I was terrified of how my parents would react. You see, my family is very traditional and religious. In our culture, it’s expected to marry a cousin or someone our folks already know back home. Marrying outside those circles? That’s usually a huge problem. When I finally told my mother I was serious about this woman, she got really upset. She said things like, “If you choose her, then don’t speak to us again,” along with other painful words. The hardest part is she’s a good Muslimah, exactly the kind of spouse you’d want. Three months ago, the pressure got so heavy that I ended things. I told her it was because of my own doubts, not my family, but honestly their pushback was the main reason. And now, I still want to marry her, and I know she feels the same. I’m stuck living with my sisters for over five years, and I just want to build a proper life-my own home, a family, all of that. My question is: how can I get my parents to accept this marriage? Has anyone here dealt with something similar, or is someone going through it right now? What did you do, and how did it turn out? Any advice or stories would mean a lot. Jazakum Allahu khairan.