I think the two advantages (?) to being diagnosed as an adult is that you've lived a life (getting p@@@ed with mates and all that) and you are the only person in charge of how you sort it.
I ate the standard diet told by the hospital for years and spent 20 yrs on a roller coaster. Thought this is **** but better than the alternative. Then discovered the Internet and sites like this. Ended up in lchf and flatter more stable bloods. Still gave the occasion low but they tend to be high 3s and safe to sort out. Plus I don't have a lit of insulin on board with not eating loads of carbs.
I hated the old hypos because it makes you feel so out of control and I really do not want someone's help to survive. I'm too young for a carer.
You've still got lots to learn especially about your own responses to food, stress, alcohol, and...... Just to begin with.
You do have wanting to be healthy in your favour. I can sometimes get a free meal out of a training session because of increases insulin sensitivity. (Means a couple of squares of 90% chocolate - the Rock and roll life).
Sorry if this preachy. Not meant to be just test, test, test. And this is on an alcohol free night!