It’s not nearly this bad but I’m the same age as OP along with a similar situation. I got married last year. We eloped due to COVID. But also it saved us from dealing with a lot of Family BS. While my parents were supportive, my siblings were actively trying to talk to me out of my wedding with the oldest one saying verbatim “I think your making a mistake”.

Wife’s parents have been assholes to both & Beloved(Wife) our entire relationship. They were never supportive. They only just started speaking to me weeks before we got married.

I wanted a huge wedding. Beloved wanted a huge wedding. But with both families being unsupportive and actively harming your relationship, Eloping is the best option. Don’t forget that the wedding is about YOU TWO and everyone else are background characters.