Lack of emotions.. causes?

Sounds like you don't have empathy (feel others pain/emotions) This is a common trait of autism. Could be narcissism, they get really angry. But you are definately not alone. I know people like this and they only act emotions to look normal and fit in, they don't feel sad for others etc. It is also a trait of sociopaths (sounds bad and doesn't mean you are a serial killer or anything). If you really want to know go to a shrink and they be able to diagnose you.