This.
It's a game people. If any game effects your real life, go join some video game anonymous group. I mean this as advice only. I am deeply concerned for others who think video games can do such things on their own.
That might be a little harsh, but kinda understand what you're saying. It is a game. I mean if you walk around 24/7 as the Dragonborn in real life and start picking flowers from peoples properties on the way to work, you may have slight issues. I don't think any game has really change my life, but they've had an impact. Which I guess is saying the same thing. And saying that...
My favourite games in the past have been SimCity 2000 and Age of Mythology. Those games taught me more about economics in a far more exciting way than what school ever did. Sim City 2000 was great because of the depth of it (I thought it was deep back then, even now it's pretty cool). I learnt about taxes, difference between light and heavy industry (knew it before then, but the game makes it pretty obvious) and a heap of other things.
Age of Mythology taught me about... mythology. And how to multitask a little bit better. Instead of just controlling one character, I had to manage a whole bunch of units and anolyze which units had strength's/weaknesses and how to fight other units. And also to build a sustaining economy considering income/expenditure (more or less the same as SimCity). Mythology is a pretty big one because how the game presented mythology was interesting. I learnt about characters I'd later see in movies and actually know what they were about. I'd also read up on the characters from history.
Getting to the point of the thread...
Skyrim - hasn't really changed my life heaps or improved it massively, what it has done though is create a black hole for time (as for most people that play the game!). I'm on my third play through (first was main quest complete, second was the same, but as quick as I could do it, which wasn't that quick) and I'm only about 13 hours in (on this play through). Not playing as much as I used to a couple weeks ago!
How it's improved my life is actually a pretty odd one, bit similiar to another post above about. I was getting into writing about a year ago, and the game has helped me get back into it. The story lines in the game aren't that interesting in some regards (and not great either), but it's still helped. The graphics have also impressed me with playing around with painting (digital) again.