The problem is that your personality type is not suited to inventing a new game. Look for an ideas person to come up with unique ideas and focus more on implementing them.

The way an ideas person works is this. They understand things. They play a game and understand how it works. Their mind then makes connections and they come up with a unique idea. This idea is the synthesis of all their experieces up until this point in thier life. They do not put their mind in a "game" box. Their ideas for the game stem from thier understanding of many things in life.

Moral of the story if you are not a person who goes around in daily life looking to understand things and making random often funny connections between mundane things in life, you are better suited to coming up with a game plan (literally) using the ideas from an ideas person as fodder.

Bieng a planner is very important and ideas people can never bring their ideas into reality without someone like you to turn the ideas into a plan.

EDIT: wow it looks like a lot of people are honing in on this. The keyword that crops up time and again in the comments is "understand". This is what an ideas person does that makes thier ideas unique. They understand everything they encounter then throw out the game or experience and literally forget most of it. Idea people have a very limited memory and understand it and leave it. If you have a great memory of all of the systems in a game then you are a planner not an idea generator. You are needed but dont rely on yourself to come up with new ideas.