Guitar Skills Assesment

score

I am stuck at Chords and Strumming and just cant get beyond that level myself

I can play leads and riffs but I do not have any idea of the theory behind which is preventing me from playing whats in my head

I understand my theory but cant improvise or jam with other musicians confidently as  I am lacking the proficency musicians seem to have

I want to compose more intelligent arrangements on the Guitar than those Im making at the moment

A long note played for the entire measure

A short note repeated immediately after a quarter note