Why do you get haircuts?

People get haircuts because it's a social norm. There is nothing bad about having long hair, the only thing that will happen is that as your hair gets longer it will break more frequently, leading to an uneven, somewhat messy appearance.

Another reason people get their hair cut is to look cool, stylish, or professional. Having a presentable haircut can be helpful when trying to get a date, interviewing for a job, or if one does not wish to be stared at on the street.