From what you say, you already are learning to adapt, and you already are going through the grieving process -- the loss of easy, good, automatic health.

You sound kind of angry about it, which is perfectly fine -- the "Why me?" and "Why do I have to change?" phase.

And you sound like you are ready to tackle the question of, "Now what do I do about this?" That's great. There's not one opinion, though. Lowered carbs is a tried-and-true option for many people. Keto is effective for some people, but it is often an unpleasant period of transition. If you want to know if your low-carb efforts have put you into ketosis, one way to know would be to buy a $10 bottle of ketone test strips at the pharmacy.

You definitely don't want to do the "fuck it" route by indulging in less healthy food options. Flip through these boards and you'll see a lot of people who did decide to rebel or ignore their condition, and they regret it. Now they are looking for advice on how to turn it around because they're more mature and/or having complications -- which is really smart of them. But you, being at the beginning, have the option of learning from other people's mistakes. You and your body are not that special that you'll benefit from junk food.

You ask: Is it inevitable that you'll become diabetic? Well, if you are "pre-diabetic," then you basically already are diabetic -- the difference, if there is one, may be that you are not at a level of severity where you must depend on medication. You may be able to control it through diet and exercise alone. If you do get to the point of medication, it's fine -- Metformin or insulin are your friends that will keep your alive and healthy.

Just keep doing your research about what diabetes is, and weighing the opinions about what your options are. It's confusing. But you will learn to decide what is best for you and your preferences. It's new to you, but you're not alone. There's millions and millions of other people out there going through the same journey of personal experiments and re-education about nutrition and biology.

Since you are so surprised by your diagnosis, the one thing that you may want to know for sure is if you have Type 1 antibodies or not. You would have to work with your doctor to get those tests.