Moving out

I'm 20, I have an opportunity to move out of my parents house (which I would love to do) but I have no idea how to do it. My parents are weird and strict and the fact that I'll be moving in with a guy would only make things ten times worse. He wants to settle within a few weeks, that's not enough time for me at all because I have to approach the news to my parents and also have the risk of them ruining everything.

Advice?