When will my penis grow in girth? I am just starting to see arm and armpit hair growth. I can also see a bit of hair above my lip. I have a pubic hair

You are okay... Glad to see you do well in developing secondary sex characteristics as described since physical growth will naturally stop soon after reaching adulthood as predetermined by genetic codes - for men, roughly at 18. So, don't worry and enjoy your youth and teens to unfold your life in decades to come.