Cub,
We will be here for you as much as friends over the internet can be.

You've been given some excellent ideas and words of encouragement here. Way to step up TBN friends!
+1 on maintaining civilized discussion with your parents.
Yes, as long as you live under your parents roof, you need to abide by their rules. But not getting a high school diploma would be one of the worst things you could do to yourself, so whatever you do, don't jeopardize your schooling. As someone else said, maybe you can maintain status quo until graduation? Are you in public school, private school, or are you still homeschooling? (Maybe I missed that part.) If you are homeschooling, there are a few options -- like GED and college entrance exams.
One thing I hate to ask but no one has mentioned, and the doctor in me makes me a little suspicious of: Are the rules, etc. all just verbal requests/desires from your parents? No physical abuse? I think everyone here has assumed that you have loving parents who have a sincere devotion to JW faith, and you feel restricted by their (perceived) "strict rules", but there is no physical or even verbal abuse. If there is, you need help right away! It's difficult to grasp the complete picture on an internet forum.
If you are not allowed to choose how you believe after you come of age, (i.e. access to information controlled; isolation from friends, relatives and the mainstream culture; put the individual in physically or emotionally distressing situations) then a religion is no longer a religion -- it is a cult. I'm not trying change your faith, but you need to examine carefully what is happening here.
I do have concerns about the military option as an "escape" from the controlling situation. It may be great, but it could separate you even further from family and church friends if you go that route.
Do you have good solid friends that are not Jehovah's Witnesses? Anyone that has parents/family that you trust? People you can talk to outside JW-land? Anyone that would take you in for a little while if they knew your situation? Hey, if you were in my area you would be welcome instantly.
Did you consider the library or internet cafes, WiFi hotspots for accessing the internet? Do you have a cell phone with internet access? Make a Facebook alias. You don't have to use a real name. Just brainstorming....
Are you looking at jobs. They don't have to be jobs in firefighting. You need income to be able to even partially gain independence from your parents. You don't want to totally freeload if you escape to another family for a length of time or have a roommate.
Marcus