The human appearance can vary a lot. Some of your classmates may be easy to distinguish from one another, whereas others may be harder to tell apart from a distance. 

A human's appearance is partially determined by their genome. This means that we have received hereditary factors that influence our appearance from our parents. 

Things like hair color and face shape are determined by the genes you inherit from your parents. Even your weight is influenced by your genes. 

However, humans also have the ability to influence their appearance themselves. For example, hair color and length can easily be modified by visiting the barber or a hairdresser. 

Each human is unique, and there is no one "right way to look". All people are valuable no matter what their appearance is like.