I have been playing the bass for about a year and a couple months. I initially started learning by getting on the internet looking for lessons and reading forums. I play in a band with 2 of my cousins and a good friend. We make our own songs so as a result I haven't really bothered diving into to learning a lot of theory. I know a few scales and a little bit about arpeggios but find that I never really use it too much when we make up new songs. Basically I listen to the guitars play for a long while to get a feel for the song and then I'll try and make up a bassline in my head that will add to the song. After I have the notes in my I head, I then figure them out on the bass and throw them in. Every now and then I'll try and just play root notes and throw a couple extra notes in the scale and see how it sounds. So far I have created some pretty good bass lines to really bring the songs out. I was wondering though, am i at a big disadvantage making basslines by ear rather than using more theory?