No.
You fit squarely within the normal range of men.
If you want a bigger penis you are in the majority – most men would enjoy a larger penis.
Opting to increase penis girth is more normal (some might argue) than:
Investing significant time in the gym body-building (steroids and supplements)
Spending excessively on luxuries for the ego, such as the cliché of a sports car
Just going through life unsatisfied with an important aspect of your body and identity when there is a relatively easy solution.