Still playing guitar like piano

I still play the guitar like a piano. It’s most obvious when I try to play along&#xA;with the lead guitar part in a recording of a two-guitar band. Often, the lead&#xA;guitar just has a simple single-note riff or triads in the upper register, but I&#xA;cannot resist the impulse to insert bass notes in the “left hand” (often&#xA;grabbing them with my thumb). It doesn’t feel like a complete part…