[Philomath]

It is scary but telling someone is the best thing to do.
As Haru mentioned, they are not your friends if they are doing this.
You can find new friends and get to know new people that will treat you how you should be treated.
IF they are doing this to you, who says they are not doing this to anyone else (or are not thinking about it). If you report them and show your school and your parents the evidence, something can be done about this so you do not have to put up with their horrible behavior any longer.
What they are doing is not right and they should not just get away with it. It hurts you and if you do not telll, they may not fully realize they are doing something wrong or they may realize it but believe that they can get away with these sorts of things which is not true.
The suggestions you were given in previous replies are very helpful and will definitely help with you being able to back up what you tell someone.
Stay strong and take care.
You can do this!