Yeah, I've been interested in it ever since I was a child.
I remember when I was five years old, I saw some graphic murder scene photos of my aunt and cousin. I saw all the blood and their dead bodies. I remember it quite clearly. It scared the fuck out of me, in a numbing way. Made me realize how mortal we are and how powerless we can be in certain situations.
Ever since then, I've just been thinking about it. Wondering about it in different ways. What it would be like, what our brains go through as we are dying. I often think about why I sometimes try so hard in a life that's just destined to end.
I also think about the afterlife sometimes. I'm almost positive that there is no afterlife, but I often entertain the possibility that there might be one and wonder what it would be like. Especially ghosts I really don't want there to be an afterlife, though.
I have experienced reoccurring suicidal thoughts since middle school, so I often think about suicide as well. (Many of the times it has been passive, however.) It's come to the point that even when I'm not really suicidal and I'm completely fine with living, I find comfort in imagining my death. I have some fears about it, but more often it's just soothing, like this all will end soon.