Sounds like you've done your research. The one thing I don't think I saw was hormone blockers-- it's the standard treatment for trans teens and, I think, should stop your cycles. If you're considering the mini-pill, you should also consider depo provera, implanon, or the Mirena intrauterine device. All are progesterone-only, long-term and reliable. The mini-pill has to be taken at the same time every day, or it gets unpredictable. Depo and implanon have a reputation for weight gain and can make your periods irregular for the first few months. But most people have no periods at all by the end of the first year, and the weight gain is usually minimal compared to what people gain on their own-- and it's more of a problem for people who are already heavy. The Mirena is a hassle to get put in, and it's gotten some bad press. But the bad press is *false*, mostly lies and exaggerations from lawyers who want to make money off of lawsuits. And the procedure to get it put in is similar to what you'd go through for an endometrial ablation.
Endometrial ablation at your age is a *bad* idea and I would be very worried about you seeing any doctor who would do it. This is a treatment meant for women near menopause who are having heavy periods. It's a great procedure for the people it's meant for-- but it has a very specific purpose. It's far from 100% to stop your periods at all, certainly won't stop them forever, it can cause significant scarring which can lead to chronic pain, and it won't do anything to stop the hormonal cycling. Frankly, a hysterectomy would be safer, and no reputable surgeon would do that for someone so young. You still need all your organs at this point.
You really should find a doctor you trust to talk about this with. You're doing your research, but it's hard to figure out which information is reliable on your own, and there's a lot of bull out there on the internet. What you've said suggests that you've gotten some bad info. You need someone on your side who has the medical knowledge to give you good advice. If there's a planned parenthood near you, they'd be a good start. Depending on where you are, they might be surprised by the trans thing at first, but they won't be judgmental, and they've got the knowledge you need. You can't figure this out all on your own.