When guitarrists start to play, they almost always have to play songs that other people composed, playing the same ones over and over again. I always think that once you like a song you can try to play it several times with no interruption, but lots of my friends stop playing the guitar because they are tired to play the same thing and they still don't understand how create songs.
It is valid for the begginers to play songs from other musicians, but they should play these songs with your own harmony and rhythm, which gives you more incentive. Learn how you can improvise the music. This way, you can start thinking about how to create your own songs
Musicians don't play to other musicians. They play with them. It is possible vary the notes even in the same song. It all depends on how much you know, how you use the neck of your guitar and how you know your instrument (not only the guitar, if you play another one).
To know how to improvise, we'll have to exercise the chords and notes, and after this we'll learn that the notes construct the chords. And after this we can start to use all notes that compound a chord.
