you may but if not, don't worry about it. INSTEAD learn what women actually like and here is a hint; PENIS IN VAGINA is not near the top and unlike all the locker room bravado SIZE does not matter and most women fantasize about a well hung stud till they get one and they don't go back
average penis size 5.1 to 5.9 inches 85% fall in this area
every minute u spend worrying about size is a waste of time and shows a lack of knowledge and understanding