It can be as simple as your classmate asking you to copy your homework and as difficult as your friends wanting you to try drugs for the first time. Negative peer pressure takes place when someone tells you to do things that you know or feel is wrong, hurtful, or dangerous.
Words can hurt.
Friends can make you feel so pressured into doing something, you feel you have no choice but to go with the flow. It is during your teen years that you start gaining more personal freedom and are in the position to make more decisions by yourself FOR yourself. If you LET them make up your mind, you're giving up that control. Lots of teens worry about not being liked and unpopular if they don't go with the flow. Life is about making decisions and each decision you make will lead you down a different path.