I feel your pain. I have spent a good amount of time in the last two years since I started playing going through the lessons here and elsewhere. I figured it was time to learn some songs. The song lessons on GT are excellent. Even with this, I make mistakes all the time. I have "mastered", and I use this word lightly, Stairway to Heaven, Maybe I'm Amazed, a couple of Stevie Ray songs, Love in Vain, and now I'm working on Here comes the Sun. These are from my early adulthood and they are my favorites. But it is frustrating when you lose your place, miss a chord, screw up a lead, etc. Then I put the guitar down and look at one of the first lessons that I went through in the beginning and I see how easy it is now. I struggled with it at the time. I have made tremendous progress to just attempt to have these songs sound like they should. I realize that if the guitar was easy, there would be a lot of Stevie Rays, Eric Claptons and even Anders! out there. Remember that it's fun to do this stuff. Worry about your family, your job or something else. Then pick up the axe and have fun.....