Hello, I'm sorry to hear that you are having some depression from your diabetes. If it's because your worried that you've been diagnosed with a life changing disease, then let me try to ease your worries.
I'll be 55 years old in October. I was diagnosed with Type 1 Juvenile diabetes in 1975. I've been living with it 'NO" strike that, it's been living with me for over 43 years now. My strongest advice to you is that this is one disease that you can control and not let it control you. Does it take some lifestyle changes? "YES". But these are changes that after a short while will become second nature and you won't even think or worry about them.
The first thing you need to do is educate yourself on the different thing that are associated with Type 1. Learn about the effects on Insulin and your body, What it is, how it works. A lot of diabetics don't understand the finer impacts on what they can do to limit a lot worry and unnecessary grief that this can cause down the road. This is a disease that you can live a very healthy and worry free life with for many many years or you can neglect it or it will sneak up on you and cause a lot of damage.
Here is a link to a very good article on insulin and how it works in the body: http://www.eattoperform.com/2013/05/10/myth-insulin-makes-you-hungry/
My second and biggest recommendation to you is to talk to your endo and get yourself on a insulin pump and CGM (Continuous Glucose Monitor) system. When I was first diagnosed in 1975 the size of pumps was almost the size of a small shoe box and I said "NO". I couldn't imagine myself going outside and trying to play carrying a purse around to hold this thing. I stuck to daily injections (only once a day) taking "Regular" (shorter acting) and "NPH" (Longer Acting) and trying to stick to a strict diet. Which for a young boy was virtually impossible. Also this was a time before Test strips to check your sugar levels, I had to use "Clinitest" system
here's a link to what it looked like: https://loricruit.com/2016/07/08/being-a-type-1-diabetic-in-the-1970s/
Also the only diet drink was "Tab" and the only sweetener was "Sweet n Low".
There is a silver lining to you being diagnosed in 2003 and that is the advances in medicine and the equipment to combat it are light years ahead of what I grew up with. Trust me when I say this "I would change places with you in a heartbeat".
Here is another option I've been looking into that is becoming more advanced it's called "Islet cell Transplantation" you should look into it also.
Feel free to reach out and I'll try to answer any questions you have. Just remember "you have the control" but it's up to you to use it.