It can be daunting for a child who is starting Primary School to make new friends.
It is even impossible to some. My autism spectrum disorder was much more serious in that time (1999-2007), and I have not had any friends. Almost the whole class bullied be. The same can be said about middle school (2007-2012), which I finished as a private student.
I am so sorry you had to go through that. It is terrible to me that teachers do not see what is going on. I hope your life is much better now