I think people stop themselves from doing the things they want to do. I just think you never know how long you're going to be around so you might as well do the things that are intriguing. Nobody really cares anyway so you have to do what makes you happy.
I approach each project with a new insecurity, almost like the first project I ever did, and I get the sweats, I go in and start working, I'm not sure where I'm going.