Hello Sir,I M 25 Years Old N My Problem Is

Hello sir,I m 25 years old n my problem is my penis size which is just 13 cm when errected..I just want to increase my penis size..i have seen many adds of oils,penis enlarger pumps etc to increase the penis size but i dont know whether these products work or not..Some of my friends say these things do wonders and some say these products dont work and even harmful for the penis....So i just want to know it from u whether these products really do what they say or its just a marketing stratergy..if its just a marketing stratrgy then is there any other way to increase the penis size except surgery...