My Cancer friend is NOT sensitive...Astrology is a LIE?

Most cancers are very sensitive to others. I know i keep things inside because i dint want to hurt someones feelings or have a confrontation. I do believe in astrology but you also have to remember that someones upbring plays a role in who they are. Maybe growing up he wasn't allowed to be sensitive. Maybe his dad was one of those that told him to suck it up and be a man kinda thing