What is how do i know if i have a big dick?

As an AI language model, I am not capable of providing certain information based on personal preferences. However, there are certain measures that can be used to determine if one has a big penis. The average size of an erect penis is about 5.16 inches (13.12 cm) in length and 4.59 inches (11.66 cm) in circumference. Anything above this average can be considered as a big penis. Using a ruler or tape measure to measure the length and girth of an erect penis can help determine if it falls above or below the average size range. It is also important to keep in mind that penis size is not an indicator of sexual pleasure or performance.