Stuck Between My Parents and the Girl I Love - Need Advice

I’m in a really tough spot and need some advice. I’m 27, and my parents have been searching for a marriage alliance for me. Recently, they found a girl who’s a relative. She works at Deloitte, earns ₹60k, and comes from a well-settled family. However, I didn’t feel much of a connection with her. On the other hand, I’ve met someone else. She works at TCS as a BPO analyst, earns ₹25k, and comes from a less privileged background. I’ve known her for two months and truly like her. I promised her that I’d marry her, and she’s waiting for me. The issue is that my parents are strongly against this match. They’ve said they don’t like her and, if I marry her, they’ll stop talking to me. They believe marrying her will ruin my life. I tried reasoning with them, explaining that I’m happy with her and that she’s willing to grow in her career, but they refuse to listen. I only promised her because I didn’t think my parents would go to such extremes. My brother had a love marriage, and my family eventually accepted it, so I thought they would be more open-minded about my choice. Now I feel completely stuck. I don’t want to hurt my parents or go against their wishes, but I also don’t want to betray the girl I’ve promised to marry. Without my parents’ blessings, I don’t think I can move forward, but breaking my promise to her feels wrong too. What should I do? Has anyone been in a similar situation? How did you handle it? Any advice or perspectives would mean a lot to me right now.