I need help...

So, I am 17 years old and I've always been a good child. Well, I went out w a guy (nothing happened, I swear by it) And didn't tell my dad. At first, it was gonna be a group of friends and him and my dad would've said No bc he's strict. I want more freedom as I'll be 18 in February.

Well, I ended up saying something to my step sister about how I had a hoco date and it came out that a boy went to the movies and she threatened to tell my dad if I didn't. So I did.

He wanted to kick me out and never see me again. Wanted to cut me out of my last year of school and take everything away and never see me again. So now I'm trying to secretly move from my dads to my moms. How can I do this? Could someone please help me wo him finding out?