You know, sometimes i'm playing a game and i suddenly start questioning what i'm doing. Like "should i really be spending my time doing this?", "look at how many games I have waiting to play, maybe i should play one of those?", "what the hell were they thinking when they designed this!?!".

I was replaying CC over the last few weeks and I was enjoying it. I was doing the missions, taking my time with the story, and basically really getting into the game. But despite this I started to think "These missions... are kinda the same thing over and over.. kinda getting bored of this now", but of course I was conflicted in that I thought I should tackle these missions to make the most of the game almost as if I had some form of duty to complete something I wasn't particularly enjoying.

Grinding has a similar effect on me. Why should I have to grind? Is this really fun?

When playing older games that I have completed, I already know the story and so perhaps grinding/levelling/collecting is my new goal for playing so its not all that bad. But being forced to grind on a first play through has started to make me question if this is a good way of spending my time, especially when so many other games (let alone work etc) are waiting to be played.

In the end I quit doing the missions and just finished the game.

So, I don't think you're lazy, just your priorities have changed.