Oh God, let's please not go down the "I'm not calling you stupid, just that the types of games you play are made for stupid people" route.
I actually wanted to point out that I grew up reading books and studied literature at university.
However, when I got stuck playing league of legends and after that dota 2 for almost 5 years (a couple thousand hours), around age 23-28, I had a rather hard time sitting down with any kind of fiction and not scream at the slow pace of the book. I was doing alright studying and reading technical documentations, but I had to force myself to sit for 30 minutes and read fiction, and even to play point&clicks and RPGs because I knew I was losing a piece of myself that I found way too important to just let go. It took a while to get back, but it only took time, patience and letting go of habits that were not beneficial in the long run.
It all comes down to supernormal stimuli, as discussed in this comic.
http://www.stuartmcmillen.com/comics_en/supernormal-stimuli/