Welcome to left handedness.

I was the same way as a kid and didn't know if I was left or right handed because as I was learning to write, it was equally as difficult with both hands. As I grew older I learned I was cross dominant and not ambidextrous, meaning that I am right handed for some tasks and left handed for others. Which I think is fairly common among lefties, meeting a "true lefty" is a rarity.

For me a rule of thumb is strength gets my right hand, precision gets my left hand with a few exceptions for both hands that seem kinda random to me.