Moving out?

I'm 20, turning 21 in July, about to finish getting an associates degree. I love my family but I cant stand living here anymore. I don't know what to do. My parents are very strict and treat me like in still in high school. On multiple occasions the have told me if I cant make good decisions my dad will make them for me because thats his job and it will be until I find a husband. I want to move in with my boyfriend. In April we will have been together for 6 months but its already the best relationship i have ever been in. I don't know how to go about telling my parents.