My advice would be to learn as much about it as possible so that you understand when you go high/low why it happened. I read all the books here
https://diabetes.gifts/top-5-books-every-type-1-diabetic-should-read/?amp=1 and now feel like I have a really good understanding of what is going on in my body and I can predict pretty well what will happen when I eat or do exercise. If I recommend only one book, it would be think like a pancreas.
This doesn’t mean I always get it right and I also loathe that we have to become so academic about things that others take for granted and I definitely have days where I feel like you do, but as I said, I choose life and hope you do too.