I think Im a sociopath?

From the time I was small I have had a real detachment from people I have often had act like I actually care. I have to plan everything before I do it, And if it goes wrounge I get fairlly angry. The thoughts of blood doesn't bother me, a matter of fact my sister was bleeding quite badly and I started laughing and singing the song blood from mcr (don't even really like them). I often make a game out of manipulating people. I sit for hours and just think of nothing but of apperently "creepy thing" qouted by one of my friends.