I've felt this way even when I was like 7 or 8 years old. If I was home sick with a cold or something and had my nan babysit me, I'd often just lie on the couch in front of the TV and just spend the hours watching crap on TV. Even THEN I found daytime television downright depressing. Game shows (namely Price is Right), soaps, "news", terrible cartoons -- it would give me a headache. At that time, my only real recourse was turning on a movie or something.
Anyway, I'm almost 30 now, and had a day off a few weeks ago. To kill a little time I just watched a bit of TV. I lasted about 15 mins before I had to get up. The only way I can describe it is "shocking".