No your a good size I play for my school I weigh 56kilos and am 5 foot 2 I play wing inside and outside center and flanker so no your actually quite big
To me you sound more like you would suit the position of inside centre, the two biggest attributes you need in the centre are ball handling and tackling, but you need to be fairly fast as well, In my own opinion you are looking for a number 8 which is 6ft+ but I have seen smaller guys smash it at number 8, it also comes down to personal preference, what do you prefer smashing someone? Or using your ball handling skills? You get to do plenty of both at inside centre Hope this helps
Depends what level you play at. If its county or above then I would say u r too small
who cares about rugby lol