Unless you're a true prodigy, you're going to have to practice for a while being bad before you get any good. And it will seem like a waste of time. I remember that feeling well. But don't worry about wasting time, because it'll be so worth it. It's my experience that in the end, life lessons and guitar lessons begin to blur in all sorts of interesting ways.
Diary of a Player: How My Musical Heroes Made a Guitar Man Out of Me (ed. Simon and Schuster, 2012) - ISBN: 9781451674354