I use my left for most activities and I hold the lid in my left hand.
Since I am primarily a lefty and am usually surrounded by right-handed people, I have always found the irony of jars quite amusing. Why? Anatomically, it is much easier to generate leverage to open a jar if you hold it in your right hand and twist the lid with your left. The muscles that move your left hand counter clockwise are larger than the muscles that move your right hand the same direction(no matter what hand is more dominant). The moving of one’s wrist away from the body feels more natural also(which is why a right hand dominant world made clockwise the tightening direction in the first place). So…are you weird? Nope. If anything, the people that jokingly suggested that are making it harder on themselves to open a jar. Thanks to hand dominance, they never noticed the easier option. It is awesome to see a number of righties here that prefer the lid in their left hand!
Living as a lefty in a world made for righties is actually really odd(handshakes, smeared ink, three ring binders, ball point pens(meant to be pulled, not pushed), kissing/hugs(usually done on the right), passing someone on the street/stairs(also done on the right), cashier handing you money/a receipt(they expect you to stick out your right hand and seem confused if you are a lefty), the string that holds the stylus on the signing pad is never long enough(and you have to sign without anything to rest your hand on), etc.) so jars are one area we can celebrate. I waited four hours to post this so sorry if it was long. 🙂