Hey Nat. I suffer/ed from depression that manifested very intensely around that age.
I can't really pinpoint it to being diabetes based exactly, but I'm sure it can't have helped.
I feel I wasted a considerable amount of my life this way and so dearly wish I'd come to these conclusions earlier in life.
While not wanting to sound patronizing, I'm 37 now. I've got two kids of my own and I'm so much happier. The trivial matters in life gradually evaporated and the important condensed to leave me where I am now.
My children created perspective for me, leaving me astounded in the knowledge of how much wasted emotion I'd thrown at trivial matters.
Most things we worry about do not matter at all.
Diabetes for me has always about finding a balance between health and not letting it rule over me so much that I can use it as an excuse. My control isn't as tight as some, but perhaps I've swapped over some normal lifestyle for that, as opposed to being absolutely obsessed with the perfect numbers and to hell with all other aspects of my life.
In short, life gets easier and considerably simpler and enjoyable. I would not have ever said this at age 19. I was too busy considering if I should be alive at all.