How am I supposed to talk to an endocrinologist about possible nerve damage?

I was diagnosed with T1 when I was around 11 and I remember having pain in my limbs and feeling like I'm getting stabbed with a hundred needles since I was 8 or 9. Recently, I've become 99 percent sure that it's somehow related to my diabetes because it's much worse when I blood sugar is high. I wouldn't usually want to bring it up, but it's getting really painful and it's getting hard to move. I'm nervous about getting yelled at or blamed for it. How should I bring this up? Also, I'm 17 and my parents aren't taking this seriously and think I'm overreacting, so I don't know how to talk to them about this either.