Moving out

Im 21 years old n been in a relationship for almost a year with my 22 year old boyfriend. We Complety love each other sooo We decided tht we wanted to live together n started looking for apartments. We found a great deal on a studio apartment tht we can afford. We're goin to look at it on tuesday.. We told his family and they were completly supportive... Then i told my family... Long story short... My mom yelled at me and reemed me out n now giving me the silent treatment and my brother is takin bets on how long me and my bf are gonna last. There are rules tht i have complied with and never gave a problem with them..like a 10:00 curfew and askin to go out. I feel i have the right to move out and start my life with someone that i see myself having a future with.. I have a job,i go to school and i pay my bills. So why am i getting this treatment? I just wanted to vent :/