Lack of Creativity

I was sitting in a workshop today that wasn't very interesting. I started doodling. There are a couple things people recognize about my doodling. I mainly repeat the four same shapes in different colors, tones, and dimensions. They involve pretty much straight lines only.

Rarely do I venture to try a new shape, and rarely do I doodle without using only straight lines.

Is there something to be gleaned about my personality from this? Why aren't I more creative? Am I a perfectionist? Am I just afraid to try new things?

Feel free to psycho-analyze me based on my doodles.