I need help

Patient: Hi my name is jimmy im just hit 19 this year and on my 19th birthday i have my 1st sex with a random girl she told me that my penis was small so i went and mesure it havea a result of 10cms when fully erected. i have read thru alot of topic about this online but they keep on poping on with scames, till i looked at this other web they said something about to see a docter and it might help you but it allso said that it will only work if its when your 14 years of age or something i was wondering if its too late to get help now? ty for your time