Ultimately, the only person who can really, really help you, is YOU. Until a year or so ago, I expect your Mum, or another adult, controlled everything about your diabetes, just as they did their best to control what you ate, when you went to bed, who your friends were and so on. You are now at an age, when you increasingly control all these things for yourself - and it's quite a responsibility. Going to bed a bit late, or getting in with the wrong crowd, doesn't usually affect the whole of your future life, but, as I know you know, uncontrolled diabetes will.
You sound like a very intelligent young woman. You have already recognised that you have a problem, which is the first step in dealing with problems - and you have to deal with this one. Here's one way of looking at it: It's just another piece of tedious ****, rather like menstruation, that you just have to deal with. There is no choice, and if you are going to enjoy life and get all possible pleasure out of it and not let it hinder fun and relationships, there is no alternative, but to get on with it.
It's about 45 years since I was your age and I have no experience of T1 diabetes, so I'm not sure if I have been of any help, but at least my reply will bump your post up on the forum a bit.
Sally