Suggest Treatment To Increase The Penis Size

Hi i am 19 years old and i am worried about my penis size. It is only 4 inches erected and about 4.3 in girth. I have never had sex because i feared that girls might not even feel anything when i am inside of them. Therefore, I have started to look for penile enhancement methods that work. I heard jelqing works and I have also came across an oil called super-vir, and pills called vigrx. Do they work? If, not what should I do?