When I was 12 or 13, I began taking lessons from my cousin, who says now that she was just a few lessons ahead of me! She had a thing for Blues and showed me the pentatonic scale, some Stones, Freddie King, Zeppelin and Aerosmith... Her brother also played, but at a pretty high level, and showed me "Godzilla", "Flying Turkey Trot", "Rock Bottom", "Emerald" and a few other tunes right square in my sights.
From that point, I began pulling things down by ear - "Dr Music", "ETI", some Sabbath - and gradually, plugging pentatonics and half-step/whole-step wandering into key signatures, for something close to lead guitar. A couple of intriguing scales from Mel Bay books gave me more models around which to tune my ear to melody.
But I was playing 2-string power chords for everything. I was slavish about playing things cleanly, mimicking inflection really studiously, but it took me a long time to feel comfortable playing full, or even 3 and 4 string chords. I'd say the problem was part underdeveloped technique, part lack of instruction and part desire to play Sabbath/UFO/BOC and other metal the way I heard it emotionally. My lack of chordal sophistication has become less problematic, bit by bit, but it STILL dogs me, quite honestly.
My college bands were alternately drudging and great. Some of the time, I was the Private Perfectionist compensating for a drummer and bassist who couldn't play...together and other times, later on, I got to play with several guys WAY above my level. The latter context allowed me to relax and push mySELF a bit more. These days, I make some use of web tutorials, but spend a lot of time figuring out melodies (from almost any source) that appeal to me. More than seeking out learning (I've never even had a designated, drop-D guitar), I fight against my limited chord vocabulary to try and put actual music together. All the same, guitar is probably my better voice, even now. Geez. True confessions. Hope some of this resonates, anyway.