I've had a journey with empathy, from inconsistent outward expressions of it as a child, to super sensitive empathy more and more as an adult.
When I was a child, although I was intensely loving of animals and was an emotional wreck, crying and torn apart when my kitten died when I was five years old, when my grandmother died when I was 8, I couldn't connect to the grief, and I remember being unable to react to my mother's grief.
Important to note, it wasn't at all that I didn't care or felt emotionally cold. I knew I felt something, and intellectually I knew this was a sad thing and a loss to us all.
But I remember being in our family kitchen watching my mother lean against the sideboard and sob her heart out, and I didn't go to her or comfort her not because I didn't care but because I couldn't seem to connect to how to, or that I could in fact even do that. I can't describe it any better, it was kind of like a toddler first learning to walk and watching others run and the toddler doesn't yet connect to the possibility that he too has the ability to run if he tries.
As I got older and matured into an adult, I began to actually connect more and more to the suffering of others, in a way that actually grew to be closer and closer to feeling it myself or being able to imagine what it must be like.
Even though when I was child I was extremely imaginative in fact, because I was intensely creative and artistic and mildly talented in art, music, composing, etc, it's like I couldn't "imagine" my way into connecting with the feelings of other people. Other people were my disconnection area, not because I didn't want to but just because I somehow felt separated -- I can't really explain it more than that.
But as an adult, I attribute my growing empathy to the fact that I started to have my own serious losses of people closest to me, such as my parents dying. When my mother died -- to whom I was closest in the whole world -- I was an emotional wreck similar to when my pets had died. I fully felt the impact and my grief was severe, internal, external, I was devastated. That seemed to be the start of a different phase in my ability to empathize, because as the years went on and other devastations happened to me, I became actually super-sensitive to the sadness of other people, even strangers.
It began to be that even seeing a disaster on the news in which people were killed or injured, affected me because now I can fully connect with the personal tragedies which that event will inevitably be incurring to those strangers. These days I connect to and feel that extremely intensely to the point where I cry. It's not fake, it's not phony, I really am feeling pain for those people I don't even know. Personally I believe that it's because I've now been through things in my own life that caused me terrible emotional pain and loss on many levels, something about those flipped a switch in me regarding the same in others.
But it's been an arc of progress, from what must have looked like a child standing there impassively staring at my mother crying and not knowing that I could come out of myself and be an element in that situation -- I guess that's the very definition of "autism" -- you're "in yourself" and turned inward instead of feeling part of what's around you -- all the way to being able to learn what certain things might feel like because I'd been through them too and since we're all human there may be some shared feelings and reactions.
I'm now TOO tuned into the pain of others, and my empathy is too sensitive to even stand watching the news much of the time.
I have always had my emotions close to the surface in general ways, but the empathy took a while to grow and come to the surface also.