I am ambidextrous. I do absolutely everything with both hands and how others irl say, (with "grace and sync"...*bleh*). I trained myself to use my right hand in the event where I become crippled in either hand. So I was born a lefty, but I trained since I was little to be ambidextrous.
I'm right-handed, and my girlfriend is ambidextrous, but she prefers to use her hands for specific purposes. For example, she rights with her right hand, she shoots an arrow with left hand, she eats with left hand, and she draws with right hand. It depends on the activity she does.
I'm a righty, I thinnkkk my mom is a lefty? Then the rest of my family... I don't know xD probably right handed.
To help me tell my rights from my lefts I usually tell by writing in the air or automatically knowing which hand I draw with which considering I draw pretty often isn't too hard. Although when trying to get markings right on a character I usually have to like spin around into the way the character is facing to make sure I get the markings right.