Behind Blue Eyes

I'm not sure what's going on. I have no memory. For the past week a man with glowing white eyes has been tournamenting me, following me around and trying to kill me. The thing that troubles me the most is that he seems familiar. I'm sure I've seen him before. Then again, that could just be because he is almost a mirror image of me. The only difference is his eyes. They glow white. Mine are light blue. The only things I remember are a little brother, and my name, Collin.