The literary history of sheep. It's a thing.
Why shouldn't you write in first person? You should definitely go back and read part one of this to find out the obvious reasons. The other reason is larger but more subtle. Not as noticeable in general but more pervasive. It's the thing I think that most often wrecks first person manuscripts. I call it the "God Complex."
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And this is the part where you need to hop over to Indie Writers Monthly to find out the rest. If it was me, I'd want to know. I mean, having a God Complex is a serious thing, and you have to diagnose it early if you want to do anything about it. God viruses are hard to beat. Go read!