I really feel for you, it must be so much harder to be diagnosed as a child & navigate good control in your teens.
As the mother of an 18yr old there isn’t anything I wouldn’t still do for my son. Yes as you grow up you need to learn to handle things but you don’t have to do it entirely alone. Talk to your mother, I bet she would jump at the chance to help you & she’s maybe afraid that if she nag’s you things will be worse. Parents don’t have all the answers, we learn how to navigate life with you. I’m fond of saying parenting never gets easier, just different.
I note you live in the UK and these constant lockdowns, reopening & closing of schools is a nightmare. My son has lost out on so many things this year - a job, he’s resitting a GCSE, his driving test has been cancelled twice, seeing friends, celebrating his 18th. It is a stressful time to be a teenager right now, your life has been dramatically changed & I’ve no doubt it’s not helping with diabetes management.
Stick around the forums & we will support you however we can. Nothing in your post was weird.