What is wrong with me, I have no compassion for other people anymore?

I used to be so caring toward other people, I used to be so compassionate, but now it's like I just don't care about anyone but myself. Something is seriously wrong with me. o.k please don't judge me, but for example, if I see someone on the news or something that has a disability most normal people would feel sorry for him/her but me, I just don't care, i'm just glad it's not me, whereas if this was a few years ago I would be so sad for him/her. Another example, if someones sibling or family member dies, I don't care, I just honestly feel no sympathy for them, nothing, and again, if this was a few years ago, I would be really sorry for that person, and probably cry. I used to cry for people all the time, I cared more for others than I cared about myself. I don't know whats happened to me. I did get picked on a lot when I was 10-13, pretty badly, do you think that could have something to do with it? I noticed this change in my attitude when I was about 13, i'm almost 19 now btw.