Do you feel pressure from your friends to "fit in"? Is so, like what? How about body image, drinking, smoking, or staying out late? Peer pressure basically shows how you feel about yourself. If you are comfortable with you, then pressure from others to change or act like them is not an issue.
Remember, you are a peer for others. How about giving "pressure" to not drink or to be happy with your body. All it takes for a positive trend to begin, is for one person to get it started? If you let your friends know that you do not think it is cool to drink or swear like a sailor, and you stick to your beliefs, you will truely make a positive difference.
Let us know what happens.