Hello I'm 15 and 3 months my penis is a inch and a half. I have plenty of pubic hair. I am also 5,8 and 190 in pounds. It is about 3 to 4 inches erect and about half a inch in diameter is this normal
Don't worry about your size when flaccid - not erect. It varies considerably. Some guys are "growers" and others are "showers" - rhymes with go.
4-5" is average for a 15 year old so you're close. 5.1" is average for an adult.
Girth varies considerably. As you get older it will likely get thicker. Your penis can grow in lenght and girth into your early 20's.
Hope it helps.