It's such a tough place to be in. Another poster here was in a similar situation. Her parents had kept her from other people by home schooling her. The difference with her is that she wasn't baptized. Her parents were really pushing her to as she was nearing 18. I don't know how it ended up with her. Regardless, ultimately you have to live your life and you can't take responsibility for their reactions. If the family is torn apart at some point because you go live your life then your family is putting themselves above your happiness and that's no family that you want to be a part of, even if it doesn't feel good at the time. Obviously we all want to have normal families. Most of us didn't.
For now I'd say that you should probably just keep playing the game while making an exit plan. Once you're 18 (in the US) your parents have no say. Do you have relatives somewhere that you could go live with and tell your story to? That may be enough to get you a new start. I think some look for student loans and try to go to college and stay on campus to get away, though I'm not a huge fan of debt. Still, it may be a way to get started in life.
Pioneering since you were nine is insane. Getting baptized at eight is insane. Your parents should see that know that's too much but they're cult victims too.
Obviously you want to go live a normal life, and you should get that chance. It will be up to you to make it happen. We can only give some advice. Aside from living another life, a normal one, please be sure you really look into and deconstruct the beliefs that you've been pumped full of. If you don't they can come back up later and sabotage your efforts.
I'm so sorry that you had to live that life. My heart aches every time I see a kid out in field service because I know what they're up against.