I am also a lefty who learned guitar right-handed and have always played that way. Most of the time I'm glad, because, as has been pointed out, I can play most of the instruments rather than only a select few; and I love to buy and sell instruments and try new ones. Every so often, I wonder if I'd be a significantly better picker if I'd learned left-handed, but I doubt it.

I've thought every so often that I ought to get a left-handed instrument and learn that way, as there's some indication of arthritis in my left hand but none in my right so far. That'll probably change if I keep using the computer mouse with my right...

Firing a rifle seems much more natural left-handed, and feels awkward right-handed, but my actual scores are about the same either way. And right-handed I don't have the damn ejection port in front of my face.

Peter.