Let's say you have this new "friend." Here's how to spot if she/he is a bully:
1. She/he's bossy
2. She/he forces you to do things you don't want to do, or know is wrong
3. She/he treats you or other people with disrespect
4. She/he does rude or mean things in between moments. (Example: he/she may say, "That's stupid, your picture sucks."
5. She/he physically picks on you or other people
For lookout number 1, some people are just naturally bossy. They think they run the world, but you can be the one to help break them out of that. When your friend bosses you around, and you don't want to do it, firmly tell her, "No." She may be surprised or get angry, but a real friend wouldn't force you to do something you don't want to.