My Mom as MY ENEMY!?!? Should I stand tall!?!?! Or Let this relationship fall!?!?!?

hi, im 18yrs old & my bf is 19yrs old,we wanna have our own place,but my mom disagrees,she doesnt wants me to move to Fl with him just bec she doesnt knows him,but he flew 2 PR 2day 2 meet her & if she doesnt gets well w/him,idk wat i'm gonna do, i meen i've no other choice but 2 do this the hard way!we wanna do this SO bad!i want this 2 happen as soon as possible!atleast im not pregnant,or do drugs,i wanna keep studying, but in Fl.i live in PR by the way.i dont know what 2 do bec overall she's my mother and i dont wanna see her sad or stressed out by this situation, but its what i wanna do!we wanna get married and be happy,i know this is 4 good,i dont know what 2 do,its gonna hurt me if i leave and disappoint my fam,specially my mom!she says she doesnt wanna let me go cuz im 2 young and **** she even called me an inmature 4 even thinking about this,but overall im mature enough 2 live by my self, im a hardworking woman,i know i can do this!i just wish she supported me. Advice me ppl!!!