I agree with I Suffer. Try writing your own music. I think you'll find it much more rewarding than simply learning songs by other people (not that there's anything wrong with that, of course). You could try an online competition like riffwar.com,guitarbattle.com, or guitarwar.com for some inspiration/motivation. I've gotten a TON better over the last several months from competing at guitar war, as well as an appreciation for styles I wasn't to familiar with.