Not "usual" person with PCOS

Has anyone been diagnosed with PCOS but doesn't quite fit the bill? I'm not overweight or have any insulin resistance but was still diagnosed because of my irregular cycles and whatnot. I've been TTC for about a year now and this is my second month on Metformin. I'm afraid it won't work because I'm not the "usual" PCOS patient. Does anyone else feel like this?