Pretty much what's been said.
Give up on the idea it is going
to happen without taking the time
to learn the modes and the triads
up and down the neck.
My contribution the discussion:
learn to play melodies, or tunes.
Even the heaviest of metal songs
follows a tune. The 9 - 12 frets
are a good place to work out the
tunes. Don't go up and down the neck
until you have the tune down, even
to the point of recognizing the
key changes and the notes, especially
the first note of the change, like G/d
means change to G scale but nail the Dmaj
on the change. Write all that stuff down
(unless you can afford to buy sheet
music for all your songs.)
Now you know the tune and the key
changes, start to break the melody
apart by changing fret and inversion
as it flows. When you can do this,
you are ready to start playing lead,
which is really your own interpretation
of a melody. Even Hendrix stayed on
the basic melodic line ...I can hear
the blues players moaning as they read
this.