1. One real difference between males and females is the presence of different sex chromosomes - males typically have XY chromosomes while females have XX chromosomes.

2. Yes, I have felt unfairly prejudged before. One situation that stands out to me is when I was applying for a job and the interviewer made assumptions about my abilities and qualifications based on my appearance and background, rather than focusing on my skills and experience.

3. Some people may have certain advantages or opportunities because of the family they belong to, such as access to resources, connections, and education. However, it is important to recognize that a person's worth and abilities should not be solely determined by their family background. Everyone should be given equal opportunities to succeed based on their own merits and efforts.