This is one of those things that you just have to wait out, i will come eventually but we cannot predict when you will get hair. All i can say is i didn't start getting armpit hair until i turned 15 so you are good, there are a lot of people who are later then you. those boys who have armpit hair are probably behind you in other departments like maybe penis development for example. If i where you i would rather have a good sized penis then armpit hair. Chances are, when it comes it will come so fast and thick that you will wish you had less
. puberty is unpredictable and happens in different orders but it will happen fer ya don't worry.