I am a bit over 5ft 11" tall and I weigh 177lbs. I have very little body fat and although I have a fairly good amount of muscle I am not massively beefy (more a rock climbers physique) anyway I saw a screentest of Marlon Brando at my age (23) when he was pretty muscular - more than I am - and despite a similar height his weight on was said to be 170bs. this is just one of many examples I have noticed.
I am 5'7 and I weight 175 pounds during my senior year of football and I was not fat at all. In fact, I was really fast and had great endurance, possibly the best on the team. I think you're okay. Just keep working out, balance legs and arms and run a bit.