Girls! My 13 cm cock is small??

13 cm is average size, definitely not too small. imho

I believe that is around the average size... depends on the girth too... some are thick like a pop can and others similar to a highlighter... knowing how to use it is more important than the size... I am 7"... most of the guys I have sucked are between 5-6"....

Depends on indivitual attitude.. I'd say 13cm is about average and definetly fun (;