I don't have much advice for you regarding motivation but your statement "I never feel sick" is what got my attention. I've had type 1 for more than 50 years and probably the first 25 I was like you, partly because we didn't have much or any technology for good control. My motivation was jump started with the invention of blood glucose testing, better insulins, pumps etc. I never cared much about diabetes control, just take one big long acting insulin shot a day, eat/drink anything, more candy when I felt hypo, but I was fascinated with these newer technologies that came along and I jumped at all of them, not exclusively because I wanted to improve my diabetes, I just always gravitate to new things and ideas. The better control just came along as a big benefit.
What I didn't expect was my 25 years of thinking "I feel OK" was abruptly contradicted. As my A1C came down, although A1C wasn't invented yet, I realized a whole, dramatic difference in the way I felt. Wow, this is how we're supposed to feel. What I thought was how us humans should feel was drastically false. I now look back and think how did I ever survive feeling SO bad, we just adapt. I also never thought I was depressed then but getting better control changed my mood, Wow, this is how feeling good is! I didn't happen overnight, it was gradual but dramatic.
Because I had adopted these new control technologies so early, I started pumps in the late 70's and was one of the first pump users, I had been invited to speak at a few ADA groups demonstrating/showing this new pump treatment. I was contacted by a woman who was struggling with probably the same motivational issues your experiencing. At that time I hadn't been emphasizing the "feel OK illusion" that I'm sure most type 1's experienced back then. We didn't have many tools for good control back then. This woman couldn't believe how much of my time was taken up taking care of my D control. She told me she was shocked by how much of my time was devoted to my D, she called me obsessive about it (which I know I am) and she was unwilling to change. She commented "your whole existence is taking care of your diabetes!" Yes, it does take lots of time, can be extremely frustrating, but I've learned, and keep learning that we have to accept "the hand we've been dealt". We have to "think like a pancreas" and it becomes the normal, no big deal. I don't dwell on the time I spend on D, it's the normal, like breathing.
The sad conclusion to this young woman's story is that she died a few months later at the hand of some snake oil salesman who convinced her that he could cure her diabetes by praying it away and convinced her to stop taking insulin, she was dead in a couple days before anyone in her family new what was going on. It still haunts me today.
I was also lucky because both my two siblings are also type 1, all diagnosed about the same time, all 3 of us more than 50 years now. This was my support group and also our family normal. Get involved with anyone you can, especially socially. My involvement with the ADA helped my motivation, just meeting and talking with others in the same boat.
Embrace the tools we have now days, you'll reap the benefits of good control and years from now you'll look back and know you're better for it. Even though it hasn't always been an easy trip sometimes I think I'm better because I have D and have overcome its challenges.
Good luck Elizabeth, you've already got a good start by just thinking and asking about it,