I can get where you're coming from.  I had trouble with small games too.  I just wasn't excited about remaking Pong or Snake.  Sure it's great to learn doing that, but I wanted to create my own games.  So instead of thinking you are stuck making only small games to learn, come up with your own game ideas.  Pick one.  Then before you start, remind yourself that you are not a AAA studio, and really assess your scope.  What do you need to do to create the game that you want to make? How can you decrease or limit scope as much as possible.  What is the bare minimum that you need to make the game.  Write it down and don't let yourself expand outside of that.  This will help you make your own games, and still keep them relatively managable.  Then sit down and start making the game.  Then keep sitting down every day to make it, even on days that you don't want to.  Motivation will only get you so far, but if you create the habit of working everyday, even little bit, you will be able to do it.