I've had similar feelings before, where I didn't want to play games anymore because I didn't feel like I was accomplishing anything. It was like, the fact that you have nothing real to show for it after beating a game suddenly because a huge demotivator.

For me the solution was to take on a hobby, which was creating a webcomic. It gave me something to put my efforts into while having something to show for it. After working on that for a while, the desire to game came back.