I have been playing for about 4 months almost entirely self taught. I am pretty comfortable with the fretboard and want to learn to play some faster bass lines. The problem is that the whole time i have been playing i have been plucking with my index finger almost exclusively (except for a quick one or two notes on a higher string). I never thought much about it but now playing fast is very difficult without alternate plucking and i can't seem to make my brain do it. If i think really hard about it, I can do it slow and clumsily, but if i just relax and try to jam, i automatically use just one finger. My question is, how should i go about breaking this and any other bad habit.