Is 150 pounds an okay aim for a 6'0 man with a medium build?

I'm watching my weight, and trying to get rid of some chubbiness, I'm currently 175 pounds, 19 years old, a hair under 6'0 tall, and I would call myself, a medium/large build. Pretty big boned, Think slavic man build. I'm aiming for 150, but my friends say that is ridiculous for a man of my size, and that I would look emaciated. Thoughts?