If you are just starting out I would suggest using the same hand as your dominant hand, right/right or left/left. If you have been shooting for a while and you are doing good then it may not be that big of a problem.
I am left eye dominant but right handed. I learned to shoot a shotgun left handed and actually thought that was better because my strong hand was pumping the rounds through it, not my weak hand. When I got hired as an officer and entered the academy I selected a left handed holster, having never shot a handgun before it didn't matter. But, with practice over the course of 18 weeks or training I found that I could shoot just as well right handed or left handed, but always using my left eye. After 18 years I don't care if I am shooting left or right handed with any handgun, it just takes a little practice in the beginning. When I am in uniform I use a left handed holster, when I am in plain clothes or off duty I use a right handed holster, no confusion and no worries because I have been doing this and practicing this for many years.
If you are comfortable with your left hand stick with it, but also practice just as much with your right hand because someday your left hand may not work and you may be dependant on your right hand.
Keep practicing and good luck.