Is it normal that I'm not a sex freak like every other guy out there?

As for the question, please understand that a lot of what you hear your friends saying is just guy talk. Your friends are all trying to prove themselves to each other. Young men especially talk this way because they are not sure yet what makes them masculine. Being masculine is not, by the way, objectifying women. I think it has become popular to degrade women as nothing but a body in our culture and younger people are more likely to believe that stereotypes are what they should strive to be like. At the end of the day, your friends that talk of nothing but boobs are probably asking themselves the same questions you are asking here. They just care more about fitting in. Fitting in is for the weak-willed. It's ok to look at the opposite sex and say you are attracted but there is no need to cross the line into degrading/mean. Stay the way you are and realize that you are a normal multi-dimensional person with desires/needs beyond the superficial. You're more normal than those kids that say they only like girls based on boob size because they are not only lying to you but if they truly do choose girls based on that, they are lying to themselves that they are not better than that.