If you do not feel comfortable or are in any ways unsure of your ability to safely carry and manipulate a firearm with a certain manual of arms do not let someone goad you into a mode of carry that you feel is unsafe for YOU. There is no shame in this. As goes a famous line from a movie...
Shooting low left? My experience 90% of the time it’s the shooter. Caused by a flinch if you’re right handed. Nothing to be ashamed of. Happens to all of us on occasion. Let an accomplished shooter try the gun. They will advise where the sights ought to be.