I think there are two reasons I read. 1, i need to know something. This may be a pressing work concern, or just a genuine interest in something. A few weeks ago i read 40 pages on cocktail ice. 2, the author is really compelling. I've read quite a few novels that are just hard to put down.
I'd bet, you have no trouble with those cases. You may rifle through tech documentation till you read the paragraph or 10 that are relevant to your problem, but that part you can just breeze through. Because it matters I'd also bet there are a few books or stories you have no trouble with because the author has really drawn you in, and you care about what's happening, and it matters. If not, take a look at hemmingway or maybe chuck palahniuk. they both put a lot of effort into making short powerful stories. Survivor or invisible monsters might be worth a read.
Other stuff, well, my tolerance really depends on my level of curiosity. If i'm feeling particularly curious, i can read some pretty boring stuff, but not for a long time. Sometimes deep insights are hidden in boring words.
Anyway, you're not weird. People have different defaults. Most stuff i kind of grind through, and don't really soak up the full meaning. On the other hand, most writing is pretty bad, and isn't really worth that much effort. The vast majority of stuff is just rehashed restated rewritten copies of copies that contain enough essence of the original to give you a hint of that dopamine rush.