Without knowing what age range and gender the player is its difficult to decide what a reasonable position is. However, basing the answer on the fact that its a male youth in early teens. This is not the best position as prop requires some bulk as does the hooker - Possible positions in the forwards could be flanker or out in the backs if the person has speed.
flyhalf
wing
wing
right wing
utility back
Foward
The best position is fullback or winger, in which both positions requries the players to be fast.
it depends if you are good at catching if you are I would say fullback
fly half, scrum half or full back
Richard Stone - rugby league - was born in 1950.
well I'm 9 stone and 11 but play rugby,you could be big boned but if you wan to lose weight then do a bit of running or play a sport like football or rugby
Its appears a utility back but a good coach will advise you of the best position at this time