This greatly depends on your skills
By just statistics i'd put you as; Winger/Centre/Scrum half/
But it depends on your skills, if your quick get on the wings
If your good at seeing whats happening go scrum half
If your a good tackler but can also spot holes in defence lines, try the centres
I wouldn't recommend full back which is my position (5'11 - 180pounds) and I am 18, but if you're confident enough, try it out, its all a matter of finding YOUR position.
Good luck!
flyhalf
no# 15 is a full back in rugby union
wing
LINEBACKER
wing
fullback.
winger
right wing
jarrod hayne
loosehead prop
utility back
Foward