I'm a YC founder and I dropped out of not-one-of-those colleges (RPI). My cofounder dropped out of high school.

Why not just give it a shot? Find the powerful parts of your story (I'm sure they exist) and share them!

We applied, as GP advocates for, mostly to sharpen our thinking. Just the application process would've been worth the time, even if we had gotten declined immediately. The interview 10x'd that value, then the YC batch itself was another multiple on top of that.