It sounds like you're presenting a riddle or a puzzle. The phrase "I am inside the path" could imply something related to a specific word or concept that is located within another larger context. Meanwhile, "I am the difference of 2 numbers outside the path" suggests a numerical or mathematical element.
One possible interpretation could be the number "0," which is often considered the difference of two equal numbers (for example, 5-5=0). If you think of "path" as something like a 'number line' or a specific sequence, the difference of two numbers (e.g., a number minus itself) would indeed be zero, which lies at the center of any number path.
If you have more context or clues, feel free to share!