Ted,

A lot of times it gets out of sync due to latency problems. This could be due to not enough memory (computer, not you), slow hard drive, lot of background programs running while you are trying to record, it can even be the sound card might not be quite up to snuff.
But, the reason you wear the headphones is to keep from having feedback. If you are not using a microphone, you don't have to use them. If you do have sync problems, then you just click on the track you want to sync to highlight it, left click your mouse where you would like move the beginning of the track, left click on Project, bring your arrow down to where it says Align Tracks> left click on "Align with Selection Start" and the selected track will move.
It may take a while to catch on, but it gets easier.

<Hopefully, I haven't left anything out.>

"Those Who Do Not Learn From History Are Doomed To Repeat It" George Santayana