i am a lefty 🙂
lefty does mean a lot of nasty things, hence the reason why lefties were believed to be witches and were persecuted. in many countried children who showed elfty tendancies were trained to be righties. there are halachos where handedness makes a difference, but i think the only time it is really a problem is by a kohen/levi because its considered a mum and then the left-handed kohen/levi cant serve in the bhm”k.