Hello!
At your age, you will grow again. Usually men can grow until 18 generally.
As you ask, the average size for a man is 5.1 ~ 5.5 inches.
I found this article on internet. Hope it helps
https://pubmed.ncbi.nlm.nih.gov/32666897/
You're perfectly normal, Don't worry!
Also if you want, you can
PM me for questions about!