If only we didn't have friends, we would never have to worry about the temptations of peer pressure.
Nobody does, especially during the teen years, when friendships are so important.
This is why peer pressure and being a teenager go hand in hand. Peer pressure is the name for the conflict that arises when we have to make a choice between fitting in with the group and doing something we might not want to do, or choosing not to do it and being ostracized. The idea of being unpopular with our friends is so awful, that we lose our judgement, and sometimes choose to do something stupid, or even dangerous.