At 14 playing in an under 17 side, I'd say to start off on the wing to get used to playing against much older, bigger and experienced boys.
Flanker or 8 man for sure. Tall with a big frame but not too heavy, you'd be suited to go up and bring down the ball on lineouts. Sound just about the same size as our South African import 8 man when I was playing in college, and he was a PERFECT fit at that spot (didn't hurt that he grew up playing his entire life either i suppose!). Good luck and have fun!
Well if you are fast then wingers is the spot. U17 when 14 is a big step up so wing is probably good. You have got to be a good 1 on 1 tackler. Good luck
I say flanker or number 8