Redpill me on Diabetus. I'm worried that I might have it. I've looked up some of the symptoms and it seems to line up.

I've had a high-sugar diet my whole life, consistently eating an incredibly unhealthy amount of candy, ice cream, and other junk food. No one ever told me that I might catch diabetus.
I've also always been skinny. Is it true that diabetus only affects fatties?

I assume that if I have it, I'm still in the early stages, given that I'm able to live fine without medical assistance. Is there anything I can do to reverse this process? How can I tell for certain if I have it without going to a doctor?

I'm also schizophrenic if that matters. Thanks.