Please note: this post will be directly addressed to those hypothetical young Mormons
If you know you’re ready to leave, use quitmormon.com. It’s run by the guy from reddit who is now famous in exmormon circles for offering absolutely free legal services to anybody who needs help leaving. You can give your church id number if you know it, but it’s not required (I never memorized mine, and I sure wasn’t going to ask for it). He takes care of everything. This keeps TSCC (the so-called church) from getting all your latest info and keeps them from hassling you or harassing you. They have to talk to your lawyer instead. Pre 2015, it felt almost impossible to try to leave, but it’s a lot easier now! The years of picketing General Conference to force an excommunication trial are over!
Find a support system. Lean on your friends that have never been mormon, any family members who left, anyone you know who left. I’m an exmormon happy to answer any questions, and I’m sure there are plenty others in the notes who would be super willing to be supportive too. Exmormon groups are many and varied now, and it’s best to find the one that vibes for you. There’s a subreddit that’s popular, but I personally used - and I know this sounds weird, since I don’t have kids - a forum called Mormonism & More on the site babycenter.com. It was started several years ago by some mormons who had questions they weren’t allowed to ask on the normal mormon board (because that board required uplifting, mormon-approved answers at all times). It’s since shifted to ex-mormons or people who want to leave but can’t right now because of family situations. Even though the threads were years old, I spent weeks on that forum, reading about what other people had gone through and how they got through it, and to me, that was super helpful.
Research the culty stuff at your own peril. I liked learning about that stuff for a really long time, because I felt learning about all those secrets (I especially liked learning about the truth of the Book of Abraham) … it helped me feel valid in my choice. It helped me keep in mind that this was something that I had escaped, something that had wanted to hurt me. Missing your abuser doesn’t mean you should go back, it means you should keep moving forward. Missing your cult has the same solution. Lots of people fell for the “we’re totally not a cult!” line by TSCC. Some of them will not offer sympathy. If you want to watch the hidden camera videos of endowments and other temple stuff, I would super super recommend you have a trusted friend watch them with you. And bring comfort food. You’ll probably need it.
TSCC put out a series of essays on controversial (read: faith-killing, eye-opening, omg how could I have ever supported the people who did this) issues in mormon history. They are the Orthodox LDS pre-approved responses to a lot of the more incriminating accusations that have been leveled at TSCC over the years. They should be hosted on TSCC website somewhere, and would have been posted around or after 2015. They may reaffirm your faith now that you know TSCC’s defense, but they may push you right out the door. (Or break the shelf? Do Mormons still use the shelf analogy, or is that retired now?)
Lots of mormons become atheists after leaving. Many join mainstream xian churches. Some become witches, some study every religion they can get their hands on, some try to go back and realize all the magic (or holy spirit, if you prefer) is gone. Don’t think you have to know right away. Some people throw away or burn all their mormon stuff, some people keep it to show their kids, but again, you don’t have to make that decision right away. Some people call TSCC a cult after they leave, myself included, but you don’t have to if it makes you uncomfortable or it it doesn’t feel true to your experience.
Look up religious trauma syndrome. It’s real. The pain you will probably feel is real, the grief you will probably feel is real, and in many ways, you may have to mourn the death of what you were always told Life Will Be For You.
And learn that the world is not half as evil as TSCC told you. Your coworkers who drink a beer at the end of the day are not evil or abusive. Your friends who wear sleeveless shirts are not evil or promiscuous. You’re allowed to wear short shorts! You’re allowed to drink coffee! You’re allowed to ask questions in a faith community without being silenced or condemned! You’re allowed to not want kids! There’s a lot of unlearning here.
TLDR? You have options. You have freedom. Find nonmormon friends who will support you. Be kind to yourself.