Hi Super Sonic,
Keep this quote in mind by Brian Tracy, "Never consider the possibility of failure." I don't know much about diabetes, but it seems like health is on the top of your priority list right now (and reasonably so).
Can you exercise? There are many people who have exercised their way out of life and death situations. I just read an article the other day about a guy who underwent months of chemotherapy and through persistence and the unwillingness to give up, started winning bodybuilding competitions. Lance Armstrong fought and won testicular cancer.
As for diet, what is hard about your current diet? Do you crave sugary foods? Sorry, I'm not too knowledgeable about diabetes, but I sincerely hope you do not give up. You are capable of great things just like everyone else in your own unique way. Don't for a second let yourself think you are useless. It's nothing more than a belief and a highly disempowering one at that.
I know this may sound crazy, but try Ronnie Coleman's attitude (8x Mr. Olympia): "Lightweight!" He lifts super heavy weights, but always says "Lightweight!" beforehand to pump himself up (which is the funny part since 800 lbs deadlifts are definitely not lightweight!) How about trying to look at this problem as actually an advantage? The majority of people do not have diabetes. But if you can adapt to this problem and succeed in life, you're already a huge step over everyone else. Because you accomplished in life AND while having diabetes. That deserves utmost respect.
Wish you the best
