Yeah that is pretty rad! Coming up with your own stuff takes time man, don't worry you'll get it. If your still just a beginner, I would just concentrate on learning songs that you like. Pick out your favorite songs and learn to play them. Start with the ones that sound simple, and try to figure them out without using the internet to find the tab. If you get lost or you want to make sure you got it right then use the internet to find the tab. Once you learn more and more songs, you will be able to make up stuff on your own alittle better.