I had the same exact feeling at 25. My advice would be to work on small, achievable (side) projects and focusing on finishing each project before starting a new

I had the same exact feeling at 25. My advice would be to work on small, achievable (side) projects and focusing on finishing each project before starting a new one. I remember having lots of ideas but never really finishing anything great or meaningful, which was a source of anxiety back then. Remember, you don't have to create a new RoR or Facebook to feel successful. For example, many small open source projects provide great value for a number of people. Now at 30, I'm happy to be able to list a number of things I have done, however small or big they are.