Thats a good thing as those people will scale you up or indeed your better than you think. For example at a selective high school i'm ranked 47th in eng adv (85% raw) but from past history that should get me an internal scaled mark of around 88 (Unless we do horribly badly ...or well).
Don't go by your marks as your teachers may mark hard or when your mark gets scaled a 75% in the HSC might turn into an 83. Of course it could go the other way.