Marrying a guy without my parents consent

I've been talking to this guy for a while. He's on his deen, respectful towards his family, a provider, kind to me emotionally and values my needs when it comes to mental related things (I go to psychotherapy cause of depression and heavy anxiety that causes other mental and fysical things). Either way, we want to get married but it's been difficult since he's from another country ethnically and so am I. The one I'm from is INSANEY against mixed marriages. Of course like always this goes mostly for the women. We aren't allowed to marry outside our culture, also in our culture people know each other world wide so gossip spreads around like wildfire. My mother is really toxic and manipulative. She's the biggest cause of my mental issues. She basically bullies me on the daily and uses things I've done against me everytime. She will use things she does for me against me as well, this could be financially or an act of service. Most of the times things you have to do as a mother. My dad is lazy, he does nothing but lay on the couch all day. My parents are (government officially?) divorced but are islamically still married. My older brothers were abusive towards me before and one is a junkie and the other one is slightly recovering. My other brother is extremely mean to me at times. All of my brothers have hit me before, one of them even multiple times. My dad cusses at my mom a lot and so does my mom. My mom will slut shame me infront of my brothers and when they do it she'll literally say "cause you are" when I confront her about their behaviour. I know they're never gonna agree to me getting married to the guy I want to get married to. But their reasonings would genuinely only be his ethnicity and that's it. They have no other reason considering in all aspects he's perfect and with him my deen only grew stronger and he pushed me far away from ending my life cause of my family situation. I can't go far with my life with them in it, it's the truth. He also lives in another country the guy but he came to visit some time. I'm not sure what to do, I want to make our relationship halal as soon as possible. His parents know about me and don't mind it at all. They only care about my deen. What do I do?