You should be recording a mic to a mono track in your software. The mono track will have a pan control that lets you move the mono signal from left to right. Most of the time, stereo is created by taking a lot of mono tracks and panning them to create a stereo image.
If you want to record something in stereo, you need 2 mics. This is done on drum overheads, orchestra, chior, ambient sound effects, keyboards (without the mics, just plugged in), etc... If you only have one mic, you want to set up a mono channel and record to that. Pan it later.