Thanks dlraben! I actually did tune beforehand, my guitar has a built-in tuner. But if you don't think it was in tune then maybe its the tuner, or strings or something else. All I know is that all the light went green when I plucked each string. My ears are not trained enough to tell. Maybe it's just a cheap guitar, I have a very low end (~ $200) acoustic that I bought just to learn on.
I do have a metronome so I think what I'll do is be sure to use it for every practice session.
Will keep your points in mind. Thanks again.
-E