Being hated by friends almost the whole room. What to do?

Hello, we'll tell you about the problem.

* * (We may be a little numb)

When we were in grade 4 (we continued to the same school), the friends in the room were very friendly. At that time, we were very cheerful, bright, but like after a time, the friends that we were close to had a story with a friend in the room, and it seemed like we were being dragged into the school (although we didn't know what the story was, and we blocked that friend because we were afraid of having a problem). At that time, we and that friend were hit by the whole chat room, and mocked the gossip. At that time, we were very clear and worried about what we were doing wrong until we didn't want to go to school, but our parents forced us to go to school. At that time, we were so crazy that our parents had to call the teacher. The class teacher didn't help at all (the class teacher asked the room leader, but the room leader might look in his corner). At that time, we were so scared that we started to feel that no one could trust even the family. And the teacher called us to talk, but we didn't dare to talk. At that time, the friend we were close to had a story and quit and made us a scapegoat. Very difficult about group work. At first we were going to move to another room, but it was full, so we couldn't move (the science-math room had 2 rooms) until now we were in grade 5, close to taking the third exam, term 1. Still clear, worried and scared. As before, we try to be as normal as possible. Deep down, we want to cry a lot when going to school. Until now, we still feel no fear and not confident in ourselves as before. What to do now?