You know you are being left out when you.
Go to share go news and no one real cares or reacts.
When you want to jump in  on a game in guy class and no one will let you on their team.
When you share something really big and they really do not care if you are questioning the meaning of love.
When you come to school and look like a mess because you are have problems
When you think you are in love and they say it is just a crush. (A crush you have had since the first grade.)
Those are some of the signs you are being left out and you might want to speak up or when you explode they might not get why you are so mad.