I went thru the same sort of thoughts as you.. I cried myself to sleep every night for 6 weeks, wondering why the heck I got D and not my brithers etc. i was 20 and married and a management job. It was hard in those days, as it is now.. Except blood meters were just coming out and cost £100 and size of a shoe box (well, not quite).
How are you getting on with normal day to day living with parents and / or friends? What do they say to you? Do you find injecting and eating ok?
You will find it easier gradually, but it is a lot to cope with.. Your friends will not know what to do or say and to be honest... Your parents will try really hard to make things better for you (guilt that their genes were faulty??) - they will genuinely be desperate to help and assist you, but they may well do and say the wrong things... But it will be inintentional.
It took me nigh on 30 years to tell my mum that she irritated the hell out of me by getting rid of foods she thought were bad for me (whilst I wS in hospital). Parents want to protect you and do everything by what the medical people say to do... But you will find that you will live your life how you want to, not parents or medical people.
The only thing I would add is.. No matter what you do, always test your blood regularly and inject..you can still have a great, fantastic life-and in fact you will if you choose to be a lot healthier than your friends and family as you will slways be monitored. I am the same size as when I was 15-and I am now 50. There's not many women my age that can say that.. And thats because I have always looked after my health, eating and drinking everything in moderstionand still living life... You can too...