You've come to the right place. You'll find TuDiabetes to be full of two really vital things: a bottomless well of information from people who actually live with diabetes every day rather than having just studied it, and a source of strength and support for those occasional moments when it gets difficult and you just need to converse with people who actually get it.
Let me reinforce the comments above about getting a correct diagnosis. Not only is it a vital ingredient in working out the best possible management plan, it also has profound implications for insurance, i.e., what it will pay for and what it won't. I would personally insist on the definitive antibody tests to either prove T1 or rule it out with certainty. T2 isn't really a "true" diagnosis but rather a diagnosis of exclusion. It's what doctors fall back on when there is no proof of T1, LADA, MODY, etc. The "gotcha" is that they often do that without running the tests that would nail down the true answer.
Regarding metformin, it's one of the safest and best studied meds in the entire pharmacopoeia, and while it's mostly prescribed for T2, its action and effects are such as to be potentially helpful to anyone with any form of diabetes. It's becoming less and less surprising nowadays to see T1 patients using it. As for those side effects, they are a bit like those dreadful things that are in the fine print, or that the announcer speeds through at the end of a commercial. They do happen, but they don't necessarily tell you that this or that dire thing only happens to one patient in 10,000, or whatever. As with any medication, each individual responds differently. Some people can't tolerate metformin at all, some have moderate side effects, and some (like me) have hardly any at all. There's only one way to know what your experience will be, and that's to have some experience.
With all the progress made in treating diabetes in recent decades, which is immense, insulin is still the most powerful weapon in the arsenal by a wide margin. Joslin, pretty much the gold standard of diabetes clinics, often prescribes it to newly diagnosed T2 patients, even if only temporarily to reestablish good control before proceeding with a personalized, detailed treatment plan. It's certainly nothing to be afraid of.
Once again, welcome to the community. We're glad you found us!