Just remember - quality over quantity.
Seriously, though, I know where you are coming from. I'm the same way with Sierra. She is 23 months old and people are always telling me how small she is and it drives me nuts, because one of the main reasons I am so drawn to Newfs is because of their size. She doesn't look big to me, maybe because she doesn't have her full coat and maybe because I see her everyday. She is average height for females. The breed standard states 26" at the shoulder and she is 26 1/2", but she is still just under 100 lbs. Our vet is very happy with her proportions. She's a nice lean dog even though her parents were MASSIVE. Her mother met the averages for a male at 29" and 160 lbs, and her father was 187 lbs.