Here are some things you can do to combat bullying. They're also good tips to share with a friend as a way to show your support:
Ignore the bully and walk away
Bullies thrive on the reaction they get, and if you walk away, or ignore hurtful emails or instant messages, you're telling the bully that you just don't care. Sooner or later the bully will probably get bored with trying to bother you.
Hold the anger
Bullies want to know they have control over your emotions. If you're in a situation where you have to deal with a bully and you can't walk away with poise, use humor — it can throw the bully off guard. Work out your anger in another way, such as through exercise or writing it down.
Don't get physical
However you choose to deal with a bully, don't use physical force. You are more likely to be hurt and get in to trouble if you use violence against a bully. You can stand up for yourself in other ways, such as gaining control of the situation by walking away or by being assertive in your actions. Aggressive responses tend to lead to more violence and more bullying for the victims.
Practice ways to respond to the bully verbally or through your behavior. Practice feeling good about yourself (even if you have to fake it at first).
Talk about it
It may help to talk to a guidance counselor, teacher, or friend; anyone who can give you the support you need. Talking can be a good outlet for the fears and frustrations that can build when you're being bullied.
Find your (true) friends
If you've been bullied with rumors or gossip, all of the above tips (especially ignoring and not reacting) can apply. Find one or two true friends and confide how the gossip has hurt your feelings. Set the record straight by telling your friends quietly and confidently what's true and not true about you. Hearing a friend say, "I know the rumor's not true. I didn't pay attention to it," can help you realize that most of the time people see gossip for what it is — petty, rude, and immature.