I'm in the exact same situation. My biggest sub genres are thrash metal and death metal. I can write something easily, but the hard part is being able to write a song and accept it how it is. It's like I keep coming up with better ideas, and my tastes are evolving, so whenever I write something, I find myself changing it over and over. I guess I'll get to the point where I finally know my true identity as a guitar player, but, until then, it's gonna be tough.