What is the most frustrating or difficult aspect of living with type 1 diabetes?

I don't think there is just one frustrating thing about being type 1 diabetic. I have only known for a year but was told I have been diabetic all my life. But I think one of the frustrating parts is making sure you don't go too low or too high, and for myself personally I have a body that likes to be difficult and likes to be a mystery. For example, ill eat 103 carbs at taco johns and my sugars 2 hours later will be 119 but another time ill eat 45 carbs like I'm suppose to and 2 hours later it will 289, which makes no sense. Even my endocrinologist doesn't understand it. But when I first found out I was diabetic I wouldn't go out anywhere because I would get embarrassed about doing shots and I didn't have a freestyle cgm at first, I had to use a regular glucose meter I was so slow at it and I felt embarrassed and frustrated at it. But there is so many frustrating facts about being type 1 diabetic.