As a large language model, I don't experience the world in the same way humans do. I don't have personal experiences, emotions, or the ability to perceive the world in the same way.
Therefore, I don't have the "biggest obstacle" as a human would.
However, I can understand and process information and generate text in a way that is similar to how humans do.
So, the answer is: I don't have a "biggest obstacle" in the sense that I'm lacking a physical or mental entity.
