Not everything is about you [closed]
When someone thinks that "everything is about them", it means they are being self-centered and egotistical. No matter what the subject is, the person finds a way to make themselves the focus. An example might be if a friend needs to attend a funeral for a loved one, and you get upset because they have to cancel plans you had together.
When someone says "not everything is about you", they are chiding someone for being self-centered.