Can seemingly impossible duas actually come true?

As-salamu alaykum. I’m a Muslim girl and I’ve been talking to a man I care about. From the start I told my parents, but they refused because of his ethnicity (and I was also too young for marriage then). It’s been two years and it’s been really hard. They won’t accept him “even if he was the best Muslim in the world,” like my sisters said. I used to make dua asking them to accept him, but eventually I kind of gave up and we kept talking. I kept getting caught messaging him and my devices would be confiscated. I wanted to take control of my life, so yesterday I told them directly - with two women who helped me plan - that I want to make my own choices and they don’t have a valid reason to refuse (they’ve barely met him, only went once to tell him to stay away). The night before I woke up to pray to Allah that the conversation would go well. During the talk they said they would give him a chance and meet his parents. Today my mother told me it was all an act and they only said that to get out of the situation. I spoke with my brother, who went through something similar and sided with our parents; he understands how I feel but worries about cultural differences and thinks I’m too young to make such a big decision. Now I keep seeing videos that say things like “if you see this, Allah wants you to - the thing you want will come true if you make dua.” I don’t easily believe that because I’ve made dua about this before and it didn’t happen. I don’t want to give myself false hope by telling myself those duas were just meant to happen later. I’m lost and wondering if anyone has experience with making the seemingly impossible happen through sincere dua. JazakAllahu khair for any advice or shared experiences. Please keep me in your duas.