Don't worry about injecting. It's not like you see in the horror films, with the bad guy brandishing a syringe and the scopolomine squirting all over the place!
The modern system will be a cartridge pen where you dial in the dose, and the silicon coated microfine needles are very small and painless
It's the sort of thing that once you've done it once you wonder what all the fuss was about.
Don't hesitate, just pinch up a bit of belly fat and get stuck in
I started on tablets then changed to injection and felt better for it
Obviously this is because tablets are no longer controlling the blood sugar levels, ie they will be unacceptably high. Injection gives you better control of blood sugar, and within limits gives you more flexibility in your diet
Have you got a BS meter? If not, get one, and learn to use it & interpret the results
Search YouTube for 'injecting insulin'; there are several videos