Hm, let's look at that word "worry."
When I was younger, as in, a kid living at home, my parents fought a lot, and I spent a lot of time in the middle of things, trying to "fix" it. Of course, I couldn't do that, and I didn't get much reward from it--mostly it was a source of further upset and frustration. Over time I saw that.
I answered as being me-centered, because now most of the time I am looking after myself. That doesn't mean I'm not concerned about others or that I don't try to help anyone. If my SO is sick, I help--but I don't drop everything.
"Being helpful" or "worrying" a lot about others seems to me to be sort of a consolation prize--it's like saying, I'm not important, but at least I'm useful to these other people.
And of course, it's a great diversion from one's own problems.
Interesting food for thought... And low calorie!
Jay