Needing more focus...

I've come to the conclusion that I need to become more focused in some areas of my life.  I want to be able to contribute to open-source projects, including Ubuntu, but I realized that I don't know enough about any single project to really dive in and work on the code.  I need to find a single project to contribute (codewise) to.

I sometimes feel that there's this technological void in my life, with a desire to work on a project of some sort.  The big problem is that I have diverse interests: user experience, information security, embedded systems/robotics, etc.  I know it's a ridiculous statement to make, but even at 25, I feel like I'm behind where I'd like to be in my life.

How do you all find your niche, and satisfy that urge?  Anyone got a favorite project that needs some love?