Lizatola,
I have succeeded in practically living in a bubble yet still manage to worry about life on the inside of the bubble.
I'm sorry about your cancer anxiety as a kid and your sister's leukemia. That fear might have predisposed you to anxiety now. It's like the fearful thinking patterns can become ingrained in us, and then are hard to change.
I totally agree with Bless about the news. I don't listen to (or read) any of it. It irritates some of my friends to no end because they think it is somehow my responsibility as a human being to be aware of every horrible thing going on in the world at all times. The media wants to scare the crap out us because for some reason fear sells. We live in a very anxious society and I think it's hard to not absorb it.