Before we had diabetes, every time we were unwell it was always a case of 'take the tablets' for a week or so then every returns back to normal or perhaps you got to face a longer course of treatment but at some point there is an end to it all...
So when they break the news to you that you'll now diabetic, yes it's a confusing bomb shell, but like every previous medical ecperiences, we follow the instructions and can do really well to start of with, injecting stabing our fingers avoiding the bad foods etc..
Then as we slowly plod our way from one day to the next, it slowly dawns on us that it aint never going away we look into our futures and it seems very scary indeed.. So you want to hide from it all, if I ignore it will go away etc etc and it all becomes harder to cope with...
It's kinda of like going through the 5 stages of grief when you lose somebody close, the greiving for the life lost, and the percieved live you had ahead.. And we all not only go through all these following our own route through the stages, but we take our own time in it stage of the process...
In your case your increasing difficulties with injecting is probably your own way of having to tackle it all...
Quite often some good counselling session help us through and come to terms with our 'new' but unwanted we... I would ask your consultant if he can make a referral to a counsellor to the extra support would do you a world of good..