Why are my friends different from me?
There are a lot of factors that influences how you and your brother or sister looks like and one among them is the biological factor. There is something called genes, which is acquired from both our mother and father. Each gene can represent different characteristics traits of a person and the physical appearance. Some behavior and habits might also be influenced by genetic factors.
For example, you may be a good singer or dancer, which you got from your mom; likewise you have the habit of sleeping in a particular position like your dad. Few children resemble completely like their father or mother in terms of physical appearance; and few may not be completely like your dad or mom; they can have mixed features from our parents. Hence, even the brother and sisters from the same family would not be same.
When the members of the same family are different, similarly, your friends will be completely different from you. Because the genes carried by your friend is completely different. Apart from these biological factors, there are also nurturing aspects of the parents and caretakers that can be influencing your friends. If they are nurtured in different way of how you were nurtured, your friend will obviously be different.
See Also: What are my private body parts?