An Unfamiliar Place

I am fueled by emotions. The most powerful of those emotions are anger, jealousy, and spite. Although I was taught to be a master of my emotions, they still influence strongly over the decisions I make. The decisions are all well thought out, and consciously made regardless of whether it demands haste, or are given the luxury of time. The point is, I feel a certain way, and it affects my actions.
At least this was the way up until now.

Lately, I have been introduced to some situations, and made privy to certain information which would have once caused me to boil up inside, and most likely erupt in a total fit. However, this was not the case. Instead, I was unable to conjure any genuine feelings. I know that I dislike it, I know I am supposed to be disappointed, but I feel nothing.
This seems to only apply to the things I would have once been driven to hysteria over, the things that I would have cared most. Instead of feeling overly angry, or unreasonably jealous....nothing.
Could this be maturity? Maybe I am at a stage of my life that I am beginning to adopt an adult like view towards the undesirable. But that doesn't make sense, because it should mean that only my decision making process is changed, not my emotional receptors. I feel that I already have an adult perspective on most matters, and I don't believe that maturity means being numb.
Perhaps it's nothing else, something much worse.
Emotions put me in the position where I am able to make conscious decisions, this is what I am good at. But if I feel nothing, I am unable to determine whether the decisions made are completely competent, or sane.
I can control my emotions. Controlling emptiness, I might not be able to do that.