Notable advantage in a lot of beginner and intermediate level sports. By the time you get beyond that everyone knows how to compensate for left handedness.

Easier for you to assault a castle with spiral staircases while using a sword.

Only left-handed people are in their right mind

When fencing, left-handed people have the significant advantage of being able to dramatically switch their rapier from their right hand to their left hand, mid-combat, and announce that they are not really right-handed.