Picking a recording location is among other things influenced by the polar pattern of your microphone(s). If you use a
cardioid type mike (like your mikes) sound coming towards the rear of the mike has much less of an impact on the recording. Given that volume drops six decibels with doubling of distance and looking at the typical cardioid polar pattern below you can see that playing facing a wall that is a few feet away with the mikes pointed away from the wall and towards you is not going to be a problem. With the mikes angled quite a bit (say in XY or ORTF mike setup) I would want to be further out from the wall.
On the other hand most of the sound volume of the guitar is projected forward. Behind the guitar (and you holding the guitar) the volume is also less by many decibels. That is a consideration when sitting facing out from a wall and the mikes facing the wall.
Of course quieter sound reflections off of walls, etc. is not a bad thing. It's the rooms ambiance.