I've never been a bully or bullied, so I probably wouldn't understand completely how you feel, but please please don't use violence.
If you do, either they will retaliate, or, if they are a coward, which most bullies are, they will tell the teacher.
You should try to tell the teacher, even though it sounds weird or cowardly.
Also, tell any of your friends. I did read that you couldn't tell those particular friends, so another option could be to try and talk to other people in your class, who will probably have realised what is going on. If you get them involved in your welfare, there are more likely to be more people who will stand up for you and make you feel more secure.
Another thing you could do is tell your parents
If you do, either they will retaliate, or, if they are a coward, which most bullies are, they will tell the teacher.
You should try to tell the teacher, even though it sounds weird or cowardly.
Also, tell any of your friends. I did read that you couldn't tell those particular friends, so another option could be to try and talk to other people in your class, who will probably have realised what is going on. If you get them involved in your welfare, there are more likely to be more people who will stand up for you and make you feel more secure.
Another thing you could do is tell your parents