I can't think why I didn't mention this before. If at all possible, find a BUDDY to play with. It'll cut your learning time substantially. A lot of musicians I know are basically solitary folk, but a musical partner can really help if you want to be "goal-oriented". The simplest run or scale can take on wonderful new meanings with a chord pattern running behind it.
Just coming up with a simple vocal harmony to someone else's melody is a great feeling.
Most of the actual playing I do is solo, but when I'm at home, I often program back-ups into my Yamaha keyboard, and play them back twenty or thirty times. It really helps when learning fiddle, mandolin or banjo, to hear that chord structure in the background. Helps with tempos as well.