Peer pressure or influence is when you do something because you want to feel accepted and valued by your friends. Peer influence can be positive or negative. Coping well with peer influence is about getting the right balance between being yourself and fitting in with your group.
People who are your age, like your classmates, are called peers. When they try to get you to act a certain way, or try to get you to do something, it's called peer pressure.
You might want to be like your peers, even if they're not pressuring you. It's natural to want to fit in.