Remember that you're not alone. There are thousands out there going though the exact same struggle that you are. That's always a comforting thought.
Also, I consider you to be quite lucky. You've got things figured out at such a young age that it will be much easier for you to break free of the cult and start a life than it has been for many here. I'm not so bad off myself, but I would give anything to have known TTATT when I was your age. I know "it could be worse" is never that comforting, but better to deal with a few agonizing years now than have to deal with agonizing decades due to a spouse and children keeping you stuck in the cult.
When dealing with your parents and the elders, always remain calm. If you get angry, they've won (at least in their minds). When they come at you in defense of the cult, try to take pity on them because they don't know the truth and you do. They're even more backed into a corner than you are. You have an objective mind, and that's a threat to their world view so they'll come after you, but you can use your objectivity to beat them. You have a way out (even if it's a few years off) while they may be mentally imprisoned in the cult for the rest of their lives.
Stay strong, it'll get better. We're all rooting for you!