Only a doctor can tell you if you need to go that route though. I'm assuming they make that decision based on your HbA1c being high or going higher despite being on a metformin, diet and exercise regimen.
You want to avoid this.
As a very tired parent of a type 1 diabetic I beg you to do whatever you can about your situation. You are lucky to have type 2 because it's something you can do something about. You have choices. You should exercise those choices.