I have a problem. I have been to one lesson for the guitar, and have learned three chords. I know the three chords off by heart, cuz i've been playin them for two weeks, but I suck! I cannot change between the chords, and when I play them, they sound shitty. I was supposed to come back within the week, when I knew the chords, but I won't come back, less I can play and change the chords really goodly. How do I do this, anybody got any tips?