Like "You're on Metformin so you're most likely a type 2, or at least your doctor currently thinks you are, if they thought you were type one they would have given you insulin. I have heard of mistakes being made but only rarely. Your best bet, if you are not sure is to call the doctor and find out. That's not to say Type 2s never take insulin, it's just that we are not typically started on insulin from the beginning."