It's rare by entirely possible to be type 2 and thin.  I'm 6'3", 152lbs and type 2 diabetic.  My mother is thin and type 2 as well. My genetics are shitty when it comes to glucose metabolism.  That said, I'm not on any meds or insulin and control my issues with 90+ minutes in the gym every day, and a strict diet.  I don't test positive for type 2 anymore on any normally administered test, but an OGTT reveals my issue pretty readily. I've got a gene mutati  2dc5  on that fucks with my cells' ability to recognize and utilize insulin.  Over time my condition will get worse.  My mother went on insulin at age 62.