I'm in the same boat mate.. 173 and 65kg.. When I go to Maccas I can comfortably eat two Value meals.. One large and one small usually.. If I'm hungry I'll go two large Big Mac meals.. I eat more then a lot of my mates combined but I can't seem to gain any weight.. I also drink a tonne of milk.. Oh well, better then bein fat I guess..
Used to play in highschool. got gang tackled by two samoans from a rugby scholarship school, and pretty much did my back in. I'll go back to it once the pain goes.
Thats no good man I'm gonna start playing again next year, taking this year off to get my ankle right and loose a decent amount of weight while I'm at it. I miss playing, especially the scrums and rucks etc... I'm a prop so its what I live for!