Help?❤️

So I'm 19 years old and I've been dating my long distance boyfriend from California for almost 3 years now.. Now, I want to move there since I'm done with college for now and I have my American citizenship (I'm from Canada) so it would be a lot less hassle if I were the one to move. The problem is that my parents aren't really supportive of the whole thing because of their religion and and stuff. I don't know how to tell my dad I'm that planning to move to another country to be with a guy that I'm not married to.. Plus it's a whole lot harder since I'm still living at home and working for my dad's company. 😬 We do plan to get married but that wouldn't happen for a few years yet. Any advice on how to talk to my parents??