This sounds odd to me to be honest, I’m only 5’4 and can manage this with no stretching ever having been done , my hand span is just 8 inches. ! Are you sure you have your hand/arm ORIENTATION correct. ? When i look at my left palm whilce playing C ,the neck of the guitar is at 45degrees across my palm from index finger to inside of wrist (almost)
The easiest change for this chord is Amin to C as you only need to move your ring finger. If you can do Amin then you can do C.
Double check your hand position and give some more info if poss ok.
R,