Ok so I need opinions-

I got engaged to my boyfriend back in May, (keep in mind I'm 16 turning 17 December and he just turned 20) he's a super huge family freak and of course I want them to accept me he told them about the engagement and they freaked went off about how we're not ready and I'm immature an going off on the entire situation and I told nick if there not supportive I either don't wanna be engaged until they do or if they don't support they don't go is that bad what should I do