system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How was Force sensitivity first discovered if Luke didn't know he had any powers by the age of 18 and he was the most powerful of any Force user?

If Luke didn't realize he had something special, how did the original Jedi first know that they had something that required investigation? Did they accidentally Force push something and then realize it existed?
gpt
For most Force-sensitives without training, it basically just manifests as greater skill or aptitude at something. Like Anakin and Luke being good pilots and mechanics. Without meditation and training, that's all that their abilities will ever manifest.

But Force traditions are ancient. Tens of thousands of years old for the earliest recognizable ones, and that's not even counting the "tribal shaman" types. An ordered of cloistered monks start meditating, and one feels that they can reach out and connect with something, even other times. The monks repeat that, learn what works, train with it, and use their abilities to find and guide others like them.