It's hard to identify myself as a horror writer. (I don't, but run with this.) Here's the reasons why I don't.
First, I don't really get scared. (See Fraidy Cat post) Thus I don't have the mindset of fear, so I'm never sure I'm crafting the scene properly.
Second, I've never thought gore and shock equate to horror. A gush of blood and severed limbs just don't affect me like most people, hence why I use it differently in my stories.
Third, I don't understand the genre enough to know where I git in. Not that I couldn't learn, I just haven't.
I'm content to be me, writing stories with bite, no matter what genre they might fall into.