everything they taught me in school is a lie!!!!!

recently i learned that thanksgiving wasn't actually what is was the pilgrims killed the Wampanoag people and then ad a feast, and that humpty dumpty was king richard the third his horse was named wall and he was on a wall, his men abandoned him and he fell off the wall and was supposedly hacked into pieces unable to to put him back together, this is not what they told me in school, they told me that humpty dumpty sat on a wall humpty dumpty had a great fall made me believe that it was an egg, and then they told me that thanksgiving was that the Wampanoag people and the pilgrims had a feast together!! why did they tell us lies?? help i'm going through a life crisis right now