Is my conscience dead? If so, how can I revive it?

I'm a 19 year old guy, if that's relevant. I never feel upset or saddened, and I never shed a single tear. If terrible things happen in the news, it goes in one ear and out the other. If I witness a human being (NOT A WOMAN OR CHILD) beaten, tortured, aulted or even killed I feel nothing. I just keep walking, or watch pively. Some guy's hanging on the side of a building, sorry. I have a meeting to get to.I watch war films, people being blown apart,entire cities burning and exploding, people falling left and right...... and feel nothing. However, I cannot watch a woman or child get hurt in any way without feeling torn apart and enraged at the coward who would do such a thing. I'm a Christian, but I feel completely numb to human suffering, unless its a friend or important family member. I believe abortion is murder. I'm incapable of hurting people, my heart doesn't allow it. But I ignore whatever I see happen in the world. Is something wrong with me? Or am I just protecting my own sanity by desensitizing myself from the world? Please, I would honestly like to know. Serious answers only. Thank you and God bless.