Hi Paige
Sounds a lot like loneliness and overwhelm, to be honest. And that's not a nice combi.
Ask your specialist to put you in touch with others of your age who also have diabetes.
There may be a teen branch of a local association, and it might be interesting to swap stories with other people.
(These guys might be able to help too:
https://www.diabetes.org.uk/guide-to-diabetes/young-adults . Maybe explain your situation to them, and see what they suggest.)
Also, it might be interesting to make a list of famous and interesting people with diabetes (e.g. Anne 'Interview with a Vampire' Rice, George Lucas, . . . ), as these people are "your tribe", and it helps to know that there's others out in the wider world who also have to deal with your condition. (You've already established that there's people out there who have absolutely no idea about the condition.)
I'm in my fifties and 'got' diabetes two years ago. Doctors appointment in the morning, insulin by lunchtime. I knew nothing about the condition. I still don't, really.
But, one thing I do know, and that is that the people working in hospital are seldom judgmental.
And, if they are, you just tell them. "When you say ___ , it makes me feel ___ . Please stop it. I would prefer that you ___ .", and then tell them.
And cut yourself some slack. There's lots of things that 13 year olds have to deal with that 11 year olds haven't even started to worry about. So, focus on looking to the future, rather than measuring yourself against your 11 year old self and finding yourself inadequate.
Good luck
- Rusty