"if your so-called friends urge you to do anything you know to be wrong, you be the one to make a stand for right, even if you stand alone. Have the moral courage to be a light for others to follow." 

-Thomas S. Monson 

If you know something is wrong, you shouldn't do it. You should never let someone make choices for you. You should never do something just because a large amount of people are doing it. You should never do something just to impress people. If they value you, they'll love you for who you are and you wont need to impress them. If you want to do something, do it for yourself not for others. If its what you truly want, go for it. If your friends try to persuade you to do something bad, they arent your friends at all. Real friends dont make you do things you dont like or that you are not comfortable with. Have the courage to say no even if it means the end of a friendship. Friends are usually temporary but your reputation is stuck with you forever. Be the only light bulb that lights up in the darkest of nights, the only one who recognizes whats right and whats wrong. Be the only light thatll help people see a path of goodness. Guide people through the dark as they try to find their way to this path.