Infrared said:

well thats your problem.. your giving up way to easily.. stick with the song, may take you a little bit to get it down good..   

improvising is probably what im best at.. cause i dont have any formal training. and didnt study much theory.... its really easy once you get 'the feel' .. anyone who plays guitar knows what im talking about.. you play alot your hands just feel so comfortable on the strings, they move without you having to even think..

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I'm entirely self taught and have been playing for just about 6 years.  The majority of my playing time is spent improvising.  It's what I live to do with the instrument.  Earlier this month I injured my hand and couldn't play for 3 weeks and I went nuts, just everything mental out of whack.

Pick some songs that ARE outside of your abilities.  Don't worry about learning a song and then giving up, or even part.  Just keep playing-- you will eventually come back to these songs and they will provide a path to your next big wave of inspiration and improvement.  But I do recommend that you settle on some.  Learn them all the way through.  SLOWLY.  Deliberately.  Definitely take some time and run around, but learn the songs thoroughly over time.

For improvisation...start with one note.  Just one note.  I mean it.  Play only one note.  Play rhythmically.  Wiggle and massage that note.  Grab it and bend it up-up-up and then let it back down.  It's like meditation-- focus only on that one note and you'll eventually get into it.  Faster and faster each time, until soon, you spontaneously jump up or down to another note to fill in the melody.  Play two notes.  Back and forth.  Play patterns.  Play one of them loud and one gently.  Then, by all means, just play randomly or strum chords or whatever.  That's just an invaluable exercise.  Take the time to play along to some of your favorite songs.  Make up solos or just play the notes that sound right.  Make sure you're always in tune (at first).  You need to develop a good ear for pitch if you want to improvise skillfully. 

Hmm...when you break a string, don't change it immediately.  Play for a few days without it.  You'll be amazed at how this forces you to change the way you play and approach the guitar.  When the string returns, see how well you can incorporate it into the patterns you found with just the other strings...

Play daily.  That's about it.  Don't feel too bad if you take a break.  I stop for a week every now and then, sometimes more.  I once took an entire summer off to break some bad habits.  Oh yeah-- enjoy yourself! 


Edit: one more thing that just came to mind...I have a pretty good natural sense of rhythm and timing, but I still play with a metronome occasionally.  It can be tedious at times, but its really important to have that sense.  NOTHING kills a jam worse than someone that can't keep the rhythm and tempo for the space.