Peer pressure is basically what it sounds like: pressure from peers. Many people make the automatic assumption that peer pressure is bad, but it many cases it can be good. Peer pressure can help you achieve your goals, help you feel better, or get into an activity.
However, peer pressure can also turn you for the worse. You know- when all your friends do it, you do it too. But that ac on could be dangerous. When someone else does something, it makes you feel that you are allowed to do it too- it has influenced you.
When many people do it, it also influences harshly. You don't want to feel left out or be called a chicken, so peer pressure will kick in.
Your limbic system is the behaviors, attitudes, feelings, and ways of thinking that make you an individual.
The Limbic system is responsible for human behavior and the emotional part as well.
I hope this helps.
If they have a low self esteem it could make the mood bad and spread to the other person eventually, it can also lead to depression and high self esteem brings positive vibes to everyone, but you don't want too much of it or you could seem stuck-up, if someone tries complementing your dress don't go oh well I'm too fat in it, or yeah it looks so good on me, no one else it would look good on. Just say thanks! And give yourself complements if your feeling down :)