How to tell your parents that you want move out and you're 17?

You can’t.

You can too move out at 17, I did and never looked back. But, and I do stress this, I had a plan and I did continue going to school. Is it that bad that you are considering moving out?

I am an early graduate. I graduated in December. I would be renting the guest house from my bfs aunt and uncle and sharing it with his sister. The 1st reason I want to move out is there are wayyy to many people in my mom’s house. There are 7 people and one dog in a 3 bedroom trailer. Second reason is me and my parents and one of my sisters don’t get along

Wow that sounded like my gf a while back. Her situation is she didn’t get along with her mom so the same thing kinda like you with a room to rent that had a small kitchen were she struck a deal with with helping maintain the household from a friend of her dads. She received a very discounted rent, and still worked, and managed to do what she wanted without her mom on her back all the time. Sounds like you have a plan like she did…only difference is her mom was happy in a way she asserted her independence and left. Tell them your plans…details, job, school etc, show them your ready to be independent. Good luck.