According to scientists, the bumblebee’s body is too heavy and its wing span too small. Aerodynamically, the bumblebee cannot fly. But the bumblebee doesn’t know that and it keeps flying.
In fact, bumblebees simply flap harder than other insects, increasing the amplitude of their wing strokes to achieve more lift, and use a figure-of-eight wing motion to create low-pressure vortices to pull them up.
When you don’t know your limitations, you go out and surprise yourself. In hindsight, you wonder if you had any limitations. The only limitations a person has are those that are self-imposed.