You are pretty small for the game at a top level I'd say.
Alot of the guys I know that play rugby are around the 100kgs/220lbs mark, in varied positions (second row, centres, and fullback).
Injuries range from bumps and bruises and cuts, knee ligs through to concussions. Most of my friends have been lucky in regards to injuries, with mainly bumps and bruises, (only one needing a knee op so far).
Hope that helps a little.