What is wrong with you if you are 15 and have not gone through puberty at all yet and your penis is 5 inches and you have public hair but no facial hair and your armpit hair is just starting to grow?

Hi there, Nothing is wrong with you. Your penis size is normal. You also have (in your own Words) "a bunch of hair" which means you have started puberty. Facial hair usually is the last to develop on a lot of teenagers. You may not get any facial hair for a few months or even a year or two yet but this is perfectly normal and is nothing to worry about. You're developing normally. :-)